St. Damasus I (c. 305 – 11 December 384) was the bishop of Rome from October 366 to his death. He presided over the Council of Rome of 382 that determined the canon or official list of sacred scripture. He spoke out against major heresies (including Apollinarianism and Macedonianism) and thus solidifying the faith of the Catholic Church, and encouraged production of the Vulgate Bible with his support for Jerome. He helped reconcile the relations between the Church of Rome and the Church of Antioch, and encouraged the veneration of martyrs.
A number of images of “DAMAS” in gold glass cups probably represent him and seem to be the first contemporary images of a pope to survive, though there is no real attempt at a likeness. “Damas” appears with other figures, including a Florus who may be Projecta’s father. It has been suggested that Damasus or another of the group commissioned and distributed these to friends or supporters, as part of a programme “insistently inserting his episcopal presence in the Christian landscape”.