 Until 457, when the 532-year cycle of Victorius of Aquitaine was adopted at Rome, each agreed with Roman practice, differing from Alexandria and the East.In 525 Rome altered its rule again to the 19-year cycle of Dionysius Exiguus to conform to Eastern usage.Colman at the Synod of Whitby may have had the Quartodeciman controversy in mind when he claimed an Ephesian origin for the Irish calculations of Easter.