John Capellanus

John (died 1147) was an early 12th-century Tironensian cleric. He was the chaplain and close confidant of King David I of Scotland, before becoming Bishop of Glasgow and founder of Glasgow Cathedral. He was one of the most significant religious reformers in the history of Scotland. His later nickname, "Achaius", a latinisation of Eochaid would indicate that he was Gaelic, but the name is probably not authentic. He was in fact a Tironensian monk, of probable French origin.