De concurrentibus actionibus liber singularis
The Same, On Concurrent Actions. Anyone who strikes the slave of another in such a way as to injure him becomes liable by his act to a suit under the Aquilian Law, as well as to one for the reparation of damage, for injury is intentionally-committed, and damage is caused by negligence; therefore both actions will lie. There are, however, certain authorities who hold that when one of these actions is chosen, the other is lost; and others are of the opinion that if the action under the Aquilian Law is selected, the one for the reparation of damage will be lost; since it ceases to be proper and equitable for judgment to be rendered against him who has paid the amount of damages appraised. If, however, the action for reparation of damage has already been brought, the party will still be liable under the Aquilian Law. This opinion should be restricted by the Prætor, unless suit is brought for the excess that can be obtained under the Aquilian Law. Hence it is more reasonable to admit that the plaintiff can make his choice of the actions, and afterwards employ the other to collect anything more than he can obtain by the first one. 1If anyone steals an article which I have lent to him for his own use, he will be liable both to an action on loan, and to a personal action to recover the property, but either one of these proceedings annuls the other, either by operation of law, or by the pleading of an exception; which is the better opinion. 2Hence it was held with reference to the tenant who had stolen something belonging to the land, that he was liable both to an action for the recovery of the property, to one for theft, and to one on the lease. The penalty of theft is not merged, but the other two actions are. This is applicable to the proceeding under the Aquilian Law; for if I lend you clothing, and you tear it, both actions will lie to recover the property. After suit under the Aquilian Law has been brought, the right to sue on the loan is extinguished; and after the action on the loan is instituted, there is some doubt as to whether the one under the Aquilian Law cannot be brought within thirty days, for the reason that it is more advantageous. The better opinion is, that the right to bring it is retained, because it adds to the simple value of the property, and if the simple value has been paid, there will be no ground for bringing it.
The Same, On Concurrent Actions. Where anyone brings an action for robbery with violence, he cannot also bring one for theft. If, however, he should prefer to bring an action of theft for double damages, he can also bring one for robbery with violence; provided that fourfold the value of the property is not exceeded.