Revelation 1:9

John : a son of Zebedee; younger brother of James; the beloved disciple of Christ,a relative of Annas the high priest,a son of Mary the sister of Barnabas, and surnamed Mark,the father of Simon Peter

Patmos : a small island in the Aegean sea just west of Miletus, Asia Minor
(37° 18´, 26° 32´)