We have next to treat of interdicts or of the actions by which they have been superseded. Interdicts were formulae by which the praetor either ordered or forbad some thing to be done, and occurred most frequently in case of litigation about possession or quasi-possession.

1 The first division of interdicts is into orders of abstention, of restitution, and of production. The first are those by which the praetor forbids the doing of some act—for instance, the violent ejection of a bona fide possessor, forcible interference with the internment of a corpse in a place where that may lawfully be done, building upon sacred ground, or the doing of anything in a public river or on its banks which may impede its navigation. The second are those by which he orders restitution of property, as where he directs possession to be restored to a 'possessor of goods' of things belonging to an inheritance, and which have hitherto been in the possession of others under the title of heir, or without any title at all; or where he orders a person to be reinstated in possession of land from which he has been forcibly ousted. The third are those by which he orders the production of persons or property; for instance, the production of a person whose freedom is in question, of a freedman whose patron wishes to demand from him certain services, or of children on the application of the parent in whose power they are. Some think that the term interdict is properly applied only to orders of abstention, because it is derived from the verb 'interdicere,' meaning to denounce or forbid, and that orders of restitution or production are properly termed decrees; but in practice they are all called interdicts, because they are given 'inter duos,' between two parties.

2 The next division is into interdicts for obtaining possession, for retaining possession, and for recovering possession.

3 Interdicts for obtaining possession are exemplified by the one given to a 'possessor of goods,' which is called 'Quorum bonorum,' and which enjoins that whatever portion of the goods, whereof possession has been granted to the claimant, is in the hands of one who holds by the title of heir or as mere possessor only, shall be delivered up to the grantee of possession. A person is deemed to hold by the title of heir who thinks he is an heir; he is deemed to hold as mere possessor who relies on no title at all, but holds a portion of the whole of the inheritance, knowing that he is not entitled. It is called an interdict for obtaining possession, because it is available only for initiating possession; accordingly, it is not granted to a person who has already had and lost possession. Another interdict for obtaining possession is that named after Salvius, by which the landlord gets possession of the tenant's property which has been hypothecated as a security for rent.

4 The interdicts 'Uti possidetis' and 'Utrubi' are interdicts for retaining possession, and are employed when two parties claim ownership in anything, in order to determine which shall be defendant and which plaintiff; for no real action can be commenced until it is ascertained which of the parties is in possession, because law and reason both require that one of them shall be in possession and shall be sued by the other. As the role of defendant in a real action is far more advantageous than that of plaintiff, there is almost invariably a keen dispute as to which party is to have possession pending litigation: the advantage consisting in this, that, even if the person in possession has no title as owner, the possession remains to him unless and until the plaintiff can prove his own ownership: so that where the rights of the parties are not clear, judgement usually goes against the plaintiff. Where the dispute relates to the possession of land or buildings, the interdict called 'Uti possidetis' is employed; where to movable property, that called 'Utrubi.' Under the older law their effects were very different. In 'Uti possidetis' the party in possession at the issue of the interdict was the winner, provided he had not obtained that possession from his adversary by force, or clandestinely, or by permission; whether he had obtained it from some one else in any of these modes was immaterial. In 'Utrubi' the winner was the party who had been in possession the greater portion of the year next immediately preceding, provided that possession had not been obtained by force, or clandestinely, or by permission, from his adversary. At the present day, however, the practice is different, for as regards the right to immediate possession the two interdicts are now on the same footing; the rule being, that whether the property in question be movable or immovable, the possession is adjudged to the party who has it at the commencement of the action, provided he had not obtained it by force, or clandestinely, or by permission, from his adversary.

5 A man's possession includes, besides his own personal possession, the possession of any one who holds in his name, though not subject to his power; for instance, his tenant. So also a depositary or borrower for use may possess for him, as is expressed by the saying that we retain possession by any one who holds in our name. Moreover, mere intention suffices for the retention of possession; so that although a man is not in actual possession either himself or through another, yet if it was not with the intention of abandoning the thing that he left it, but with that of subsequently returning to it, he is deemed not to have parted with the possession. Through what persons we can obtain possession has been explained in the second Book; and it is agreed on all hands that for obtaining possession intention alone does not suffice.

6 An interdict for recovering possession is granted to persons who have been forcibly ejected from land or buildings; their proper remedy being the interdict 'Unde vi,' by which the ejector is compelled to restore possession, even though it had been originally obtained from him by the grantee of the interdict by force, clandestinely, or by permission. But by imperial constitutions, as we have already observed, if a man violently seizes on property to which he has a title, he forfeits his right of ownership; if on property which belongs to some one else, he has not only to restore it, but also to pay the person whom he has violently dispossessed a sum of money equivalent to its value. In cases of violent dispossession the wrongdoer is liable under the lex Iulia relating to private or public violence, by the former being meant unarmed force, by the latter dispossession effected with arms; and the term 'arms' must be taken to include not only shields, swords, and helmets, but also sticks and stones.

7 Thirdly, interdicts are divided into simple and double. Simple interdicts are those wherein one party is plaintiff and the other defendant, as is always the case in orders of restitution or production; for he who demands restitution or production is plaintiff, and he from whom it is demanded is defendant. Of interdicts which order abstention some are simple, others double. The simple are exemplified by those wherein the praetor commands the defendant to abstain from desecrating consecrated ground, or from obstructing a public river or its banks; for he who demands such order is the plaintiff, and he who is attempting to do the act in question is defendant. Of double interdicts we have examples in Uti possidetis and Utrubi; they are called double because the footing of both parties is equal, neither being exclusively plaintiff or defendant, but each sustaining the double role.

8 To speak of the procedure and result of interdicts under the older law would now be a waste of words; for when the procedure is what is called 'extraordinary,' as it is nowadays in all actions, the issue of an interdict is unnecessary, the matter being decided without any such preliminary step in much the same way as if it had actually been taken, and a modified action had arisen on it.