Property law
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Usucaption (Latin: usucapio), also known as acquisitive prescription,^[1][2] is a concept found in civil law systems^[3] and has its origin in the Roman law of property.

Usucaption is a method by which ownership of property (i.e. title to the property) can be gained by possession of it beyond the lapse of a certain period of time (acquiescence). While usucaption has been compared with adverse possession, the true effect of usucaption is to remedy defects in title of lands that are without encumbrance on them.

The necessity for usucaption arose in Roman law with the divide between res mancipi and res nec mancipi. Res mancipi required elaborate and inconvenient formal methods of conveyance to transfer title (a formal mancipatio ceremony, or in iure cessio).^[4][5] Res nec manicipi could be transferred by traditio (delivery) or in iure cessio.

The remaining form of conveyance was traditio. This was an informal conveyance which only required the intention to transfer and delivery of the property. If res mancipi were transferred by traditio, full ownership would not pass and the recipient would become a bonitary owner.

Therefore, another form of conveyance was required that did not necessitate a ceremony or appearance before the praetor. Because Rome was becoming mercantile, it was simply inconvenient to perform a formal conveyance simply because property was classed as res mancipi. There might also be a demand to transfer property in private between the transferring parties, such as in the establishment of fideicommissa (Roman trusts).^[6]

The need for establishing ownership by means other than conveyance was also a result of the practical defect of a system of ownership based on valid transfer. Title to property could be challenged under this system, because it depended on the good title of the person from whom you acquired the property and so on. If any person's title in the chain were challenged successfully, then this would defeat any title derived from it. This defect required a means of establishing ownership that was not contingent upon a chain of title but could be established independently.^[7]

However, if a bonitary owner kept the res (property) in his possession for a certain amount of time (two years for land, one year for chattels) his title would become full title and he could assert himself as dominus.

Usucaption was the solution that emerged to address the defects of Roman ownership. It required five elements:^[8]

1. Uninterrupted possession of the property for the requisite period (one year for chattels, two years for land);
2. The property was capable of being owned. Not a free man for example;
3. Good faith. For example, a buyer might purchase a slave (categorised as res mancipi) in good faith but find twelve months on that the vendor did not himself have good title to that slave;
4. Iusta causa. A proper ground for acquiring the property, e.g. showing that the acquirer paid for the property.
5. The property must not have been stolen any time or taken by force.

This largely ameliorated the problems experienced by conveyance as a means of establishing ownership, but could still yield harsh results. A purchaser of res mancipi could be on his way to successfully usucaping the property (e.g. 11 months in possession) but would lose his claim to it if his possession was challenged before the period of usucaption by someone who could establish title.

Usucaption was altered by the Actio Publiciana (see Gaius 4.36^[4][5]) which gave scope in the vindicatio (the action for property) for a fictitious usucaption. Such a situation would only arise where the claimant's possession of the property had been interrupted before the period required to usucape it had elapsed. The Actio Publiciana made provision for the possessor of the property to be taken to have usucaped it successfully, if he could show that he would have usucaped the property had his possession of it not been interrupted. In this way usucaption became the dominant form of establishing ownership in Rome.

In orthodox Jewish law, the right of usucaption is defined in a compendium of Oral Laws compiled in 189 CE, known as the Mishnah (Baba Bathra 3:1-ff.). The general scope of the law formerly provided for the right of possession of property in the absence of a legal deed or title, if, after three years of occupancy, no protest or counter-claim had been made to the same property.

Title by usucaption to houses, cisterns, trenches, vaults, dovecots, bath-houses, olive-presses, irrigated fields, and slaves, and aught that brings constant gain, is secured by occupation during three completed years; title by usucaption to unirrigated fields [is secured by occupation during] three years and they need not be completed.^[9]

If a dispute had arisen over property within this three-year time-frame, the property is assumed to belong to the person who challenges the claim of the illegal tenant, particularly, when the other is publicly known to have originally possessed the land or house. In such cases, if so-and-so "A" claimed that so-and-so "B" wrongfully took possession of his property, but so-and-so "B" retorted, "Yes, it was formerly yours, but you sold it to me," or "Yes, it was formerly yours, but I received it from you as a gift," - if "A" is known to have once possessed the property, he is assumed to be the rightful owner of the property, and it is the duty of "B" to show proof that "A" either sold it to him, or gave it to him as a gift. The absence of proof renders "B"'s hold of the property null and void.^[10]

A squatter who fences in the property, or who locks it up, or who refurbishes it, or who has the keys to the property delivered unto him, are all signs of legal conveyance and is assumed to be the rightful owner, even in the absence of a legal deed.^[11] After three years of occupancy the squatter cannot be evicted from the property, unless the original owner can show proof or bring witnesses who testify to the effect that the property is still vested in his name, and that no transaction, conveyance or sale was made between him and the squatter, even though he held it for three years or more, in which case the squatter is forcibly evicted from the property and the court replevins the estate to its rightful owner.^[12] The application of this law is similar to what was found in ancient Roman law, under rei vindicatio.

Three years was considered the least amount of time needed for a rei vindicatio to happen, meaning, one year being the time needed for the discovery of the illegal occupant, another year being the time needed to notify the original owner about his property being taken, and another year being the time needed for him to return to the Land of Israel from a far-away country, such as Spain, in order to evict the occupant.^[13][14] The protest must be made before at least two competent witnesses and submitted in a court of law against another's wrongful occupation of his property within the three-year allotted period, in which case the squatter's assumed right to the said property is automatically canceled, unless he can provide proof of purchase.^[15][16] The squatter who fails to provide a legal deed of purchase, or who lost his deed of purchase, forfeits his hold of the property.^[15] The language of protestation by the rightful owner is such, or to the effect of such: "So-and-so, who is making use of my courtyard or my field, is a thief."^[15] The person who protests another man's wrongful hold of his property must be known by others to be the rightful owner of that property, and if not, the squatter is able to say, "I take no heed to his protestations."^[17][15]

The Jewish custom in Jerusalem during Ottoman rule over Palestine was that wherever it was widely known by the public that a fellow Jew had been deprived of his property under the land tenure laws known as Mülk (where Jewish-owned land was given by the Ottoman conqueror to Muslims,^[a] or Khuraj lands given to Christians and taxed, in exchange for Muslim protection, which same lands became private or allodial land, held in absolute ownership), the usurping occupant was divested of his property and the property returned to its rightful owner, even if the owner could not show proof of purchase.^[18]

• Adverse possession
• Marketable title
• Usufruct