1 Legacies or inheritances given by trust had originally no binding legal force, because no one could be compelled against his will to do what he was merely asked to do. As there were certain classes of persons to whom testators were unable to leave inheritances or legacies, when they wished to effect these objects they used to trust to the good faith of some one who had this kind of testamentary capacity, and whom they asked to give the inheritance, or the legacy, to the intended beneficiary; hence the name 'trusts,' because they were not enforced by legal obligation, but only by the transferor's sense of honesty. Subsequently the Emperor Augustus, either out of regard for various favourites of his own, or because the request was said to have been made in the name of the Emperor's safety, or moved thereto by individual and glaring cases of perfidy, commanded the consuls in certain cases to enforce the duty by their authority. And this being deemed equitable, and being approved by the people, there was gradually developed a new and permanent jurisdiction, and trusts became so popular that soon a special praetor was appointed to hear suits relating to them, who was called the trust praetor. 2 The first requisite is an heir directly instituted, in trust to transfer the inheritance to another, for the will is void without an instituted heir in the first instance. Accordingly, when a testator has written: 'Lucius Titius, be thou my heir,' he may add: 'I request you, Lucius Titius, as soon as you can accept my inheritance, to convey and transfer it to Gaius Seius'; or he can request him to transfer a part. So a trust may be either absolute or conditional, and to be performed either immediately or on a specified future day. 3 After the transfer of the inheritance the transferor continues heir, the transferee being sometimes regarded as quasi-heir, sometimes as quasi-legatee. 4 But during the reign of Nero, in the consulate of Trebellius Maximus and Annaeus Seneca, a senatusconsult was passed providing that, when an inheritance is transferred in pursuance of a trust, all the actions which the civil law allows to be brought by or against the heir shall be maintainable by and against the transferee: and after this enactment the praetor used to give indirect or fictitious actions to and against the transferee as quasiheir.