Foillan was a seventh-century Irish saint, bishop, and abbot who served as a missionary in East Anglia and Frankish territories. Born in Ireland around 600, he was the uterine brother of Saint Fursey. After helping establish a monastery at Cnobheresburg in East Anglia, he later fled to the region of modern-day Belgium following a violent invasion. He is remembered for his leadership in founding religious communities and for his role in spreading the faith through the establishment of monasteries in Neustria.