Conquest and the formalities of law established the use of _codicils_. If a Roman was surprised by death in a remote province of the empire, he addressed a short epistle to his legitimate or testamentary heir; who fulfilled with honor, or neglected with impunity, this last request, which the judges before the age of Augustus were not authorized to enforce. A codicil might be expressed in any mode, or in any language; but the subscription of five witnesses must declare that it was the genuine composition of the author. His intention, however laudable, was sometimes illegal; and the invention of _fidei-commissa_, or trusts, arose form the struggle between natural justice and positive jurisprudence. A stranger of Greece or Africa might be the friend or benefactor of a childless Roman, but none, except a fellow-citizen, could act as his heir. The Voconian law, which abolished female succession, restrained the legacy or inheritance of a woman to the sum of one hundred thousand sesterces; and an only daughter was condemned almost as an alien in her father's house. The zeal of friendship, and parental affection, suggested a liberal artifice: a qualified citizen was named in the testament, with a prayer or injunction that he would restore the inheritance to the person for whom it was truly intended. Various was the conduct of the trustees in this painful situation: they had sworn to observe the laws of their country, but honor prompted them to violate their oath; and if they preferred their interest under the mask of patriotism, they forfeited the esteem of every virtuous mind. The declaration of Augustus relieved their doubts, gave a legal sanction to confidential testaments and codicils, and gently unravelled the forms and restraints of the republican jurisprudence. But as the new practice of trusts degenerated into some abuse, the trustee was enabled, by the Trebellian and Pegasian decrees, to reserve one fourth of the estate, or to transfer on the head of the real heir all the debts and actions of the succession. The interpretation of testaments was strict and literal; but the language of _trusts_ and codicils was delivered from the minute and technical accuracy of the civilians. III. The general duties of mankind are imposed by their public and private relations: but their specific _obligations_ to each other can only be the effect of, 1. a promise, 2. a benefit, or 3. an injury: and when these obligations are ratified by law, the interested party may compel the performance by a judicial action. On this principle, the civilians of every country have erected a similar jurisprudence, the fair conclusion of universal reason and justice. Chapter XLIV: Idea Of The Roman Jurisprudence.--Part VII.