Pope from 366. On the death of Liberius a conflict broke out between the supporters of Damasus and those of his rival Ursinus, each being elected in a different basilica. The Emp. Valentinian I intervened on behalf of Damasus and banished Ursinus. Damasus was active, by synods and with the help of the imperial power, in suppressing heresy (Arianism, Donatism, Macedonianism, Luciferians). He strengthened the position of the see of Rome, made provision for the proper housing of the Papal archives and adorned the tombs of the martyrs. At a Council probably held in Rome in 382 he promulgated a Canon of Scriptural Books and he commissioned St Jerome to revise the Biblical text (see Vulgate). Feast day, 11 Dec. See also Fides Damasi and Tome of Damasus.