Oswald of Northumbria
In one notable instance, Columba appears in a dream to King Oswald of Northumbria, and announces the king's forthcoming victory against the King Catlon (Cadwallon of Wales) in the Battle of Heavenfield. The people of Britain promise to convert to Christianity and receive baptism after the conclusion of the war. This victory signals the re-Christianizing of pagan England, and establishes King Oswald as ruler of the entirety of Britain.