Digestorum libri
Ex libro XIV
The Same, Digest, Book XIV. If I commit the transaction of my business to a party who is liable to me in an action for quadruple damages (within a year), and, after the lapse of the year, for only simple damages; even though I should begin suit against him on mandate after the year has elapsed, he will be bound to pay me quadruple damages; because a party who undertakes the management of another’s business is required to pay him what he would have been compelled to pay others.
Julianus, Digest, Book XIV. The respect due to parents and patrons is of such a character that an action for fraud or injury can not be granted against them, even though they may appear by an attorney; for although, by the terms of the Edict, if judgment be rendered against them, they might not be considered infamous; still, according to public opinion itself, they will not escape the imputation of infamy through the very proceeding. 1Judgment for forcible possession is also forbidden to be rendered against them.
The Same, Digest, Book XIV. If you lend ten aurei to Titius, by my direction, and bring an action on mandate against me, Titius will not be released from liability; but I ought not to have judgment rendered against me in your favor, unless you assign to me the rights of action which you have against Titius. Likewise, if you bring an action against Titius, I will not be released, but I will only be liable to you for the amount which you cannot collect from Titius.