Patmos in Fausset's Bible Dictionary

Revelation 1:9. One of the Sporades. A small rugged island of the Icarian Sea, part of the Aegean; 20 miles S. of Samos, 24 W. of Asia Minor, 25 in circumference. The scene of John's banishment (by Domitian), where he "was in the Spirit on the Lord's day." The rocky solitude suited the sublime nature of the Revelation. On a hill in the southern half of the island is the monastery of John the divine, and the traditional grotto of his receiving the Apocalypse. In the middle ages called Palmosa from its palms; now there is but one, and the island has resumed its old name Patmo or Patino. It is unvisited by Turks, without any mosque, and saddled with moderate tribute, free from piracy, slavery, and any police but their own.