in church-history, a decree or edict of the emperor Zeno, made at Constantinople, in the year 492, by which he pretended to reconcile all parties under one faith. It is generally agreed that Peter, patriarch of Alexandria, and Acacius, patriarch of Constantinople, were the authors of this decree, and that their design was to compliment the emperor with a right of prescribing regulations in matters of faith. The emperor, by this decree, arrogated to himself the right of being head of the church. Pope Simplicius, however, in the year 483, condemned the henoticon, and cited Acacius, the chief promoter of it, to appear before him at Rome; but it was not entirely suppressed till the year 518.