Ultan was an Irish monk who later became an abbot. He was the brother of Saints Fursey and Foillan. He was a member of Fursey's mission from Ireland to East Anglia in c. 633, and lived there both as a monastic probationary and later alone as an anchorite. In c. 651 he accompanied his brother Foillan to Nivelles in Merovingian Gaul where they continued their monastic life together.
