Justus archbishop of Canterbury, accompanied Laurentius and Mellitus when they departed from Rome, in 601, to join the mission at Canterbury. He was a Roman by birth; was also first bishop of the see of Rochester. He was translated to Canterbury in 624. The great event of his short occupancy of the latter see was the extension of the Kentish mission to Northumbria. This was effected by the marriage of Edwin, the king of Northumbria, with Ethelburga, the sister of Eadbald, king of Kent. Justus consecrated Paulinus, July 21, 625, to be archbishop of York. He died November 10, 627. See Hook, Lives of the Archbishops of Canterbury, 1:100 sq.