Patmos (now Patmo), an island of the group called the Sporades in the Grecian archipelago, about 20 m. S. of the S. W. extremity of Sa-mos, and about 30 m. W. of the coast of Asia Minor; pop. about 4,000. It is an irregular mass of barren rock 28 m. in circumference, and in the time of the Roman emperors was used as a place of banishment. To this island St. John the apostle was exiled by Domitian, A. D. 95; and here, according to universal tradition, he wrote the Apocalypse, and perhaps his Gospel also. On the side of a hill a cavern is pointed out by the Greek monks, who have a monastery in the vicinity, as the exact spot where the evangelist received the revelation. The monastery, built by the Byzantine emperors in the 12th century, is inhabited by about 50 monks, subject to the patriarch of Constantinople. On the E. side of the island there is a small village and a good port. The island is subject to the Turks, but the inhabitants are all Greeks. They subsist by fishing and commerce, and by agricultural labor on the mainland or the more fertile islands, migrating for the purpose every summer.