Oswiu of Northumbria
Bede writes that James lived in a village near Catterick, which "bears his name to this day". He reports that James undertook missionary work in the area and lived to a great age. During the reign of King Oswiu of Northumbria, James attended the royal court, for he celebrated Easter with Oswiu's queen, Eanflæd, Edwin's daughter. Both James and Eanflæd celebrated Easter on the date used by the Roman church, which led to conflicts with Oswiu, who celebrated Easter on the date calculated by the Irish church. These dates did not always agree and were one of the reasons that Oswiu called the Synod of Whitby in 664 to decide which system of Easter calculation his kingdom would use.