Cosmas (called HAGIOPOLITES or COSMAS OF JERUSALEM), a hymn-writer of the Greek Church in the eighth century, was the foster-brother of St. John of Damascus. The teacher of the two boys was an elderly Silician, also named Cosmas, who had been freed from slavery by St. John’s father. St. John and Cosmas went from Damascus to Jerusalem, where both became monks in the monastery of St. Sabas near that city. Cosmas, however, left the monastery in 743, when he was appointed Bishop of Maiuma, the port of ancient Gaza on the southern coast of Phoenicia. The Greek Church observes his feast on 14 October. As a learned prose-author Cosmas wrote comments on the poems of Gregory of Nazianzus; as a poet he is regarded by the Greek Church with great admiration. It considers Cosmas and St. John of Damascus the best representatives of the later Greek classical hymnology, the most characteristic examples of which are the artistic liturgical chants known as “Canons”. The hymns of Cosmas were originally intended to add to the interest of the services at Jerusalem, but through the influence of Constantinople their use became universal in the Orthodox Greek Church. It is not certain, however, that all the hymns ascribed to Cosmas in the Greek liturgical books were really his compositions, especially as his teacher of the same name was also a hymn-writer. Collections of hymns, varying in number, are attributed to Cosmas, and may be found in Migne, P. G., XCVIII, 459-524, and in Christ-Paranikas, “Anthologia grmca carminum christianorum” (Leipzig, 1871), 161-204. For the above-mentioned notes or scholia on the poems of Gregory of Nazianzus see Mai, “Spicilegium Romanum”, II, Pt. II, 1-375, and Migne, P. G., XXXVIII, 339-679.
KRUMBACHER, Gesch. der byzantinischen Literatur (2d ed., Munich, 1896), 674 sqq.