Caput VIII. Lex Aquilia: Precatorem Parare
by Michael Lambert
February 2026
Caput VIII. Lex Aquilia: Precatorem Parare
by Michael Lambert
February 2026
C APUT VIII. L EX A QUILIA , P RECATOREM P ARARE
proprietas nuda
Bare ownership (of property)
Said of property owners with no right of use or enjoyment
R OMAN L AW AND THE C ITIZEN
Roman Law and the Citizen series was presented in January 2025
We continue to explore the development and maturation of Roman jurisprudence.
You, as a Roman citizen during the Principate era, what are your legal options to redress
iniuria , ‘harm’ committed against self?
This six-part series continues in two, three-month segments during the period
J ANUARY -M ARCH AND J ULY -S EPTEMBER
(To familiarize yourself with Roman jurisprudence, consult the introduction: January 2025)
* * *
qui haeret in litera haeret in cortice
He who sticks in the letter, sticks in the bark
Said of those who neither assert substance nor meaning
I NTRODUCTION
precatorem parare , to prepare the applicant . Who is the applicant? In most instances the applicant in an action is the petitor , the petitioner , also known as, the plaintiff
Life in ancient Rome or in our era; you sense, you have suffered iniuria , harm . How do you translate a “sense” of injustice into a legal action?
This chapter looks at lex Aquilia , specifically procedural aspects. Identifying the petitor is the first step in a long, legal road. Identifying the defensor , the defendant is easier but, finger-pointing has problems. To define the petitor and defensor ; the chapter looks through the lens of property and property ownership
If the defensor is a free person, then the person may be liable for damages. Concerning slaves, a person held in bondage cannot themselves be sued. Yet, lex Aquilia does permit a slave to be liable
If the slave acted without his master’s knowledge, the petitor can sue the slave owner. Facing suit, the slave owner may either surrender the slave to the petitor , known as noxal surrender or pay for the damage. Noxal surrender may limit the slave owner’s cost of damages
The issue is the worth of the slave under noxal surrender. If the slave’s worth is equal to or greater than the cost of the damage, this is a good for the petitor
In the alternative, if the slave’s worth is lesser than the cost of the damage, this is a good for the defensor
To counter the prospect of a defensor avoiding liability; the jurists devised theories under which the slave’s owner may be statutorily liable. Let us cite the circumstance, not a slave but your employee. The jurists developed the theory of vicarious liability concerning acts by third parties
To complicate the matter, in some instances, the act by the third party may be criminal. In this instance the lex Cordelia , a criminal suit is brought first, not to pre-judge the lex Aquilia , a civil suit
Nota bene: Roman jurisprudence is a continuing series, first commenced in January 2024. The series assumes you
are living during the Principate era. Rome is at her apex. You as a civis , “citizen”; how do you navigate through daily lief? Along with the necessities of life, such as housing and food, how do you assert one’s legal interest?
The noun erus , has the sense of “ property owner ” or “ owner ” or “ proprietor ”. Both men and women can own property. One of the benefits of property ownership is the enjoyment of said property, such as … aedificare ostium hic, possumus nunc aditus ad atrium , “…build a door here, we can now have access to the patio”
When Roman jurisprudence speaks of erus , the law is speaking of the property owner . Matters change when Emperor Justinian, of the Byzantine Empire, complies Roman obiter dicta . The noun erus is deleted and the noun dominus , “lord” is inserted as the word-of-choice for property owner
dominus introduces a ranked social division regarding property ownership. It is from the Byzantine era we inherit the noun “landlord” and its derivatives, such as “lord of the manor” and “Lord” as a title (tying land ownership directly to receipt of an honorific of ennoblement)
erus is egalitarian, dominus is hierarchical
* * *
The Cases give an insight into daily life, the behaviour and attitudes, of lives lead
Cases cited below: LXIX to LXXXI
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C ASE LXIX
Ulpianus 1 . 12.7.10. in the eighteenth book on the Edict. obiter dictum . A Neighbour Destroys Bees. Lex Aquilia . liability
item Celsus libro XXVII Digestorum scribit: si cum apes meae ad tuas advolassent, tu eas exusseris, quosdam negare competere legis Aquiliae actionem, inter quos et Proculum, quasi apes domini mei non fuerint. sed id falsum esse Celsus ait, cum apes revenire soleant et fructui mihi sint. sed Proculus eo movetur, quod nec mansuetae nec ita clausae fuerint. ipse autem Celsus ait nihil inter has et columbas interesse, quae, si manum refugiunt, domi tamen fugiunt
Likewise, Celsus, in the twenty-seventh book of his Digests, writes that if my bees fly over onto your (property) and you burn them up, some jurists deny that the action under the lex Aquilia lies, among them is Proculus, on the theory that the bees are not my property. But Celsus says that this is false, since the bees are accustomed to return and are a source of profit for me. But Proculus was swayed by the fact that they are neither domesticated nor sufficiently enclosed. Still, Celsus himself says that there is no difference between them and doves, which, if they escape the hand, still fly home
Footnote.
1
Ulpianus, a jurist
The question concerning the beekeeper, does he retain ownership of his bees when they fly out of the hive, from own property to another property (to gather nectar, converted into honey)?
Roman jurisprudence asserts the owner of a wild animal loses both ownership and possession when the animal escapes the owner’s control. Are bees wild animals?
In this circumstance the bees cross into and onto another property for the express purpose of gathering nectar, to make honey. Since the bees return to the owner, Proculus asserts the owner retains “ownership” of the wild animals
Javolenus 1 . D.9.2.38. in the ninth book of his Letters. obiter dictum . A Slave Held by Good Faith Possessor is Injured. Lex Aquilia . liability
Si eo tempore, quo tibi meus servus quem bona fide emisti serviebat, ipse a servo tuo vulneratus est, placuit omnimodo me tecum recte lege aquilia experiri
If my slave, whom you bought in good faith, was serving you, and during that time he was wounded by your slave, in the prevailing view I can in any case rightly sue you under the lex Aquilia
Footnote.
1
Javolenus, a jurist
This action involves property ownership, the concept of bonum fidei possessorem , the “good faith possessor”
The bonae fidei possessori , “good faith possessor” is a person who purchases property. The purchaser possesses and controls said property, but does not have title , that is, ownership of the property
The good faith possessor at the time of purchase did not realize the nature of the purchase
This action a slave possessed in good faith, is injured by another slave belonging to the good faith possessor
Javolenus, the jurist; cites the petitor may bring an action under lex Aquilia , a civil suit
Nota bene: See Case LXXIX, The Good Faith Possessor
C ASE LXXI
Ulpianus 1 . D.9.2.20. in the eighteenth book on the Edict. obiter dictum . Co-owned Slave Injured or Killed by a Third Party. Lex Aquilia . liability
Sed si commune serum occiderit quis, Aquilia teneri eum Celsus 2 ait, idem est et si vulneraverit
But if someone slays a co-owned slave, Celsus says that he is liable in an Aquilian action, likewise if he wounds him
Ulpianus 1 . D.9.2.20. in the forty-second book on Sabinus. obiter dictum . Co-owned Slave Injured or Killed by a Third Party. Lex Aquilia . liability
Scilicet pro ea parte, pro qua dominus est qui agat
That is in proportion to the share that the property owner (dominus) owns
Footnote.
1
Ulpianus, a jurist
2
Celsus, a jurist
You and a colleague co-own a slave. The slave is killed by a third party. Can each owner bring a separate suit?
Roman jurisprudence, specifically lex Aquilia ; permits each co-owner, their own action. Beware , the verdict of one owner in an action does not affect the verdict of the other owner. The following perverse outcome may occur, one owner may win with the other may loose
The above case presents one circumstance with two possible and opposing outcomes. By the end of the Principate era, Roman jurisprudence encourages co-owners to unit and to present one action to assert their mutual claim against the defensor
All legal actions have two aspects, the first is a coherent structure of laws on which the case may be advanced through the court. The second aspect, in parallel to the law; a coherent financial structure
Nota bene. The accepted course of action is to bring a civil action under the lex Duodecim Tabularum , the “Laws
of the Twelve Tables” also known as the “Twelve Tables” which establishes the actionable liability. From the year 449 BCE, henceforth, property law compensation is cash payment: praemia rei pecuniariae , a “monetary reward for things”. An in-kind or similar decision, such as an “eye-for-eye” or “tooth-for tooth” is banned (as of the year r 449 BCE. Now all successful actions, the judgement is on the basis of pecuniary compensation
To claim damages, actual damage or injury must be presented, that is damnum iniuria datum , “damage unlawfully inflicted”. Roman courts demanded the petitor must show actual harm or injury. If successful, the claim is praemia rei pecuniariae , a “monetary reward for things”. If the petitor is successful to this point in the proceedings, the actual sum awarded is based on the replacement value, that is; pretium magni ex prior anno , “ the highest price from the previous yea r”. The next issue is agreeing on the previous year’s highest pecuniary sum. The iudex , the “judge” reviews the claim and counterclaim, and in accordance with the formula determines the sum the defensor owes the petitor
The defensor , now the debtor , is required to pay the debtee
C ASE LXXII
Gaius 1 . 4.37. in the fourth book of his Institutes. obiter dictum . Creating “legal” citizen for an Action. Lex Aquilia . liability
Item civitas Romana peregrino fingitur, si eo nomine aga
aut cum eo agatur, quo nomine nostris legibus actio constituta est, si modo iustum sit eam actionem etiam ad peregrinum extendi, veluti si furti agat peregrinus aut cum eo agatur…similiter, si ex lege Aquilia peregrinus damni iniuriae agat aut cum eo agatur, ficta civitate Romana
iudicium datur
Likewise, if a non-citizen sues or is sued on a cause for
which our statutes establish an action, he is fictitiously treated as a Roman citizen, provided that it is just that this action be extended also to a non-citizen, for instance, if a non-citizen sues or is sued for theft (furtum) …Likewise, if under the lex Aquilia a non-citizen sues or is sued for
wrongful damage, a suit is granted with the fiction of
Roman citizenship
Footnote.
1
Gaius, a jurist
This action involves the civitas Romana peregrino , the “non-citizen” to either sue or be sued under the legal ficta civitate Romana , the “fiction of Roman citizenship”
The obiter dictum permits the judge to treat the non-citizen as if the person were a Roman citizen. This comment speaks to the maturity and self-confidence of Roman jurisprudence. The maturity is providing guidance to adroitly resolve issues. The aim is to quickly allow every person to get on with their life
Roman jurisprudence extents to non-Romans legal protections
Gaius asserts Roman law can be extended on the basis to do so is “appropriate”
Since the action is under lex Aquilia, statute law; the action is civil
Ulpiaus 1 . D.9.2.23.8. in the eighteenth book on the Edict. obiter dictum . Inheritability of Standing. Lex Aquilia . liability
hanc actionem et heredi ceterisque successoribus dari constat, sed in heredem vel ceteros haec actio non dabitur, cum sit poenalis, nisi forte ex damno locupletior heres factus sit
It is agreed that this action is granted both to the heir and to other successors. But this action will not be granted against the heir or others, since it is penal, unless perchance the heir became wealthier as a result of the loss
Footnote.
1
Ulpianus, a jurist
To understand this action, it is important to provide background regarding Roman inheritance law
The heir “succeeds” into the legal position of the deceased person, the assumption is the heir succeeds to the property and the duties and rights of the deceased, gratia exempli ; if a harm is committed on a person, that person’s heir can sue the defensor
Roman inheritance provides some exceptions to the concept of succession. Under lex Aquilia the heir of the defensor cannot be sued. Therefore, if the defensor dies before the suit can be actioned, lex Aquilian liability is lost
The obiter dictum speaks to the punitive nature of lex Aquilian liability
You cannot inherit a punitive prerogative!
C ASE LXXIV
Pomponius 1 . D.9.2.43. in the nineteenth book on Sabinus. obiter dictum . Damaged Inheritance. Lex Aquilia . liability
ob id, quod ante quam hereditatem adires damnum admissum in res hereditaries est. legis Aquuilae actionem habes, quod post mortem eius, cui heres sis, acciderit, dominum enim lex Aquilia appellat non utique eum, qui tunc fuerit, cum damnum daretur, nam isto modo ne ab eo quidem, cui heres quis erit, transire ad eum ea actio poterit, neque ob id, quod tum commissum fuerit, cum in hostium potestate esses, agree postliminio reverus poteris, et hoc aliter constitui sine magna captione postumorum liberorum, qui parentibus heredes erunt, non poterit…
As to lose an estate suffered before you took up an inheritance, you have an action under the lex Aquilia for what happened after the death of the person from whom you inherited. For the lex Aquilia does not name (the) owner, only the person who owned when the loss was given, since if that were true, the action could not even pass from the dead person to his heir, nor could you sue, by right of postliminium after your return, for (loss) that was inflicted while you were in the hands of enemies; and this issue cannot be differently decided without great disadvantage to posthumous children who inherit from their parents…
Footnote.
1
Pomponius, a jurist
The action looks at inheriting an estate under the following circumstance. The owner of the estate has died, but the heir has yet to receive the estate. During this time, the estate is said to “lie open”
Pomponius states, lex Aquilia statute does not cite the name of the former owner (now deceased) but only the name of the person who receives the property (also known as the heir)
Pomponius cites ius postliminii , the “law of the right of recovery”
ius postliminii refers to the legal principle that restores the rights of a person
Suppose you are captured by an enemy. During the period you are under the physical control of the enemy, you can not exercise own control of either person or property. Once released from the enemy’s physical control, the assumption is you return to your home. On return, you can now assume control, under the legal fiction; that you had never been absent in the first instance
Nota bene: The above paragraph refers to “control…person…”. The jurist is referring to the role of the paterfamilias
(within Roman social and legal structure)
In the above action, the heir may have been under the circumstance he was not able to assume his inheritance. But, under ius postliminii the heir assumes his inheritance under the legal fiction, the period of non-assumption is pushed aside as if it had never existed. He recovers his property
C ASE LXXV
Ulpianus 1 . D.9.2.13.2-3. in the eighteenth book on the Edict. obiter dictum . Inherited Slave is Killed. Lex Aquilia . liability
si servus hereditarius occidatur, quaeritur, quis Aquilia agat, cum dominus nullus sit huius servi. et ait Celsus 2 legem domino damna salva esse voluisse, dominus ergo hereditas habebitur, quare adita hereditate heres poterit experiri. si servus legatus post aditam hereditatem sit occisus, competere legis Aquiliae actionem legatario, si non post mortem servi adgnovit legatum, quod si repudiavit, consequens esse ait Iulianus 3 dicere heredi competere
If a slave in an inheritance is slain, a question arises as to who has the Aquilian action, since there is no owner of this slave. Celsus says that the statute wanted the owner’s losses to be compensated, therefore the inheritance is regarded as the owner. Hence the heir can sue when the inheritance is accepted. If a legated slave was slain after the inheritance is accepted, (a jurist says) that the action under the lex Aquilia goes to the legatee unless he accepted the legacy (only) after the slave’s death, but if he rejected it Julian says the logical consequence is that it goes to the heir
Footnote.
1
Ulpianus, a jurist
2
Celsus, a jurist
3
Iulianus, a jurist
In accordance with Roman jurisprudence: the slave, though bequeath by the legator; has no owner until the heir, the legatee, accepts the inheritance
Celsus, a leading jurist is cited: his solution is to circumnavigate Aquilian statute law by assigning an owner
Once the heir accepts the inheritance, distribution is in accordance with the legator’s stipulation. Julian, another leading jurist, is cited; the property, the slave, is assigned to the heir
Ulpianus, in a similar action is confronted with the circumstance, the slave is killed before the heir can accept the property. The obiter dictum asserts the heir has an action
Ulpianus . D.9.2.11.10. in the eighteenth book on the Edict. obiter dictum . A Usufruct of Property. Lex Aquilia . liability
an fructuarius vel usuarius legis Aquiliae actionem haberet, Iulianus tractat, et ego puto melius utile iudicium ex hac causa dandum
Julian considers whether a person who holds a usufruct or a right of use has the action under the lex Aquilia. I think the better solution is that an analogous action (utile iudicium) should be given in these circumstances
C ASE LXXVII
Paulus . D.9.2.12. in the tenth book on Sabinus. obiter dictum . A Usufruct of Property. Lex Aquilia . liability
Sed et si proprietatis dominus vulneraverit serum vel occiderit, in quo usus fructus meus est, danda est mihi ad exemplum legis Aquiliae actio in eum pro portione usus fructus, ut etiam ea pars anni in aestimationem veniat, qua nondum usus fructus meus fuit
But also if the owner of the property wounds or slays a slave in whom I have a usufruct, I should be granted an action against him, on the model of the lex Aquilia, in proportion to the usufruct, (but) so that the part of the year is also evaluated in which I did not yet have the usufruct
usus fructus , “usufruct of property” is a right to enjoy property and its profit therefrom for a term not to exceed the lifetime of the beneficiary. Usually, the usufruct is a legacy in a will, the testator designates one person the heir but grants the usufruct to another person to receive the property therefrom
An example of usufructory circumstance where the property owner is not an heir; the usufructee is the owner of an apple orchard, but; due to circumstance of physical incapacity or lives elsewhere or is absent on military service; the usufructor maintains the orchard and receives the profit (the apples)
The relationship is mutually advantageous. The usufructor “maintains the property and receives the profit”. This means he has own interest in managing the property to receive the profit. Failure to manage the property means less profit
Nota bene: The obiter dicta of the two cases are “confused”. The confusion may have originated at the time of
compilation
Case LXXVI, Julian suggests a statutory action under lex Aquilia. Paul LXXVII, suggests an analogous action, an “ utile iudicium”
Case LXXVII, cites the circumstance of the property owner slaying a slave. On slaying the slave, the owner reduces the value of own property, therefore reduces the value of the property, the usufructor sues the usufructee
C ASE LXXVIII
Paulus . D.9.2.30.1. in the twenty-second book on Edict. obiter dictum . The Pledgor and The Pledgee. Lex Aquilia . liability
pignori datus servus si occisus sit, debitori actio competit. sed an et creditori danda sit utilis, quia potest interesse eius, quod debitor solvendo non sit aut quod litem tempore amisit, quaeritur. sed hic iniquum est et dominio et creditori eum teneri. nisi quis putaverit nullam in ea re debitorem iniuriam passurum, cum prosit ei ad debiti quantitatem et quod sit amplius consecuturus sit ab eo, vel ab initio in id, quod amplius sit quam in debito, debitori dandam actionem, et ideo in his casibus, in quibus creditori danda est actio propter inopiam debitoris vel quod litem amisit, creditor quidem usque ad modum debiti habebit Aquiliae actionem, ut prosit hoc debitori, ipsi autem debitori in id quod debitum excedit competit Aquiliae actio
If a slave was given as a pledge (pignus) and then slain, the debtor has the action. But question is raised whether an analogous action (actio utilis) should also be granted to the creditor, since he may have an interest because the debtor is insolvent or his suit on the debt is barred by lapse of time. But here it is unfair that he (the defendant) be liable to both the debtor and creditor. Unless one thinks that the debtor will suffer no wrong in this matter, since he is advantaged as regards the amount of the debt and will recover the surplus from him, or that the debtor should from the start be granted an action for the surplus over and above the debt. And so in these cases where the action should be granted to the creditor because of the debtor’s insolvency or because action is barred, the creditor will have an Aquilian action up to the amount of the debt so as to benefit the debtor, but the debtor has the Aquilian action for the excess over the debt
Who has the interest in the slain slave, pledged against a debt? The answer is the debtor
The jurist then asks the question, what interest does the creditor have against the insolvent or time-barred debtor?
The jurist then raises the possibility the defendant may be liable to both the debtor and creditor. Assume the slave at death was worth 10,000, the debtor’s interest is 7,000; the creditor can sue for 3,000
Marcellus, a jurist not cited in the case; speaks of a debtor who gave own slave as a pledge, but plucks out one of the slave’s eyes, thus reducing the slave’s value. The case allowed the creditor to sue the debtor
In the case of the insolvent debtor, the action benefits the creditor, since the creditor has preferred status against the debtor’s other creditors
C ASE LXXIX
Ulpianus 1 . D.9.2.17. in the eighteenth book on the Edict. obiter dictum . The Good Faith Possessor. Lex Aquilia . liability
si dominus serum suum occiderit, bonae fidei possessori vel qui pignori accepit in factum actione tenebitur
If an owner slays his own slave, he will be liable through an in factum action to a good faith possessor or to a person who received (the object) a s a pledge
Footnote.
1
Ulpianus, a jurist
bonae fidei possessori , a “good faith possessor” holds property that belongs to another person, the owner may reclaim the property at any time. Depending on the property possessed, there may be accrual of expenses. If “yes”, the good faith possessor may retain the property if the owner does not compensate the possessor
The chief distinction between property held under usufruct and a good faith possessor, under the former; the owner retains legal possession and control of the property. If there are expenses the usufructor cannot keep the property but may sue for expenses
Ulpianus, in his obiter dictum ; thought the property, a slave; is slain by the owner, the good faith possessor may sue the owner under an in factum action for expenses incurred
Even if the good faith possessor can sue under lex Aquilia , statute law; the better course of action – anticipating success – is in factum
Ulpianus 1 . D.9.2.11.9. in the eighteenth book on the Edict. obiter dictum . A Borrower. Lex Aquilia . liability
eum, cui vestimenta commodata sunt, non posse, si scissa fuerint, lege Aquilia agree Iulianus ait, sed domino eam competere
Julian says that a person who is lent clothing cannot sue under the lex Aquilia if it is torn, but the owner has the action
Footnote.
1
Ulpianus, a jurist
C ASE LXXXI
Iulianus 1 . D.13.6.19. in the first book on his Digest. obiter dictum . A Borrower. Lex Aquilia . liability
ad eos, qui servandum aliquid conducunt au utendum accipiunt, damnum iniuria ab alio datum non pertinere procul dubio est, qua enim cura aut diligentia consequi possumus, ne aliquis damnum nobis iniuria det
It is beyond doubt that those who undertake to guard something (for pay) or who receive its (gratuitous) use are not liable for wrongful loss inflicted by a third party. For what care or diligence of ours can prevent someone from inflicting wrongful loss on us?
Footnote.
1
Julian, a jurist
Roman jurisprudence, a person who receives the gratuitous use of an object or who is hired to guard it, is held to a very high standard of care called custodia, a “ guard ”
The custodia may be liable if the object is lost or damaged due to carelessness or negligence; except in the circumstance of vis maior , “irresistible force”. An example of vis maior is “forceable theft”
Case LXXX, Ulpianus citing Iulianus says the custodia is not liable. While the custodia is held liable for things in his care, he is not liable for third party action of torn clothing. If the clothing is torn, sue the owner not the custodia
Case LXXXI, Iulianus supports Ulpianus, a custodia is not liable for third party loss
C ONCLUSION
Case LXIX, A Neighbour Destroys Bees establishes two fundamental points of property ownership: possession and control. The case also identifies the petitor and defensor in an action. Though bees fly to neighbouring properties to gather nectar, the person who has possession of the beehive, the domicile of a honeybee; has “possession” and “control” of his property that is the honeybee, though a wild animal, returns to the beehive
In quick order Case LXXI examines co-ownership of property, commencing with either single or joint action and the award of damages based on per centage of ownership. Case LXXII considers suing or being sued by a civitas Romana peregrino , a non-Roman citizen through the legal device of ficta civitate Romana , the fiction of Roman citizenship
Case LXXIII examines, within the context of an inheritance, the issue of: does inheritor have the privilege to sue, “yes”? There is no reciprocal privilege for the defensor . Case LXXIV establishes the inheritor who may not be able to assume the inheritance, the privilege of property owners exists under postiminii , the law of the right of recovery
Finally, issues of petitor and defensor , of property “possession” and “control” are discussed concerning the pledge , the good faith possessor , the borrower , and the custodian
* * *
qui facit per alium facit per se
He who acts through another is deemed to act in person
Said of those, who employ agents are responsible for the agent
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