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Eusebius wrote that John ministered to the church in Ephesus, which Paul had founded (Acts 19:1-20), for many years.6The Isle of Patmos where John spent some time in exile is close to Ephesus (cf. Rev. 1:9-11). As previously noted, Eusebius wrote that John composed his Gospel when he was at Ephesus.7During the first century, that city was one of the largest centers of Christian activity in the Gentile world.8
