The "Annales Cambriae" record a battle for 644 at a site which they call by the Old Welsh name "Cocboy"; the same name is found in a later form as "Cogwy" in "Canu Heledd"; and the battle described in these Welsh texts is agreed to be identical with the Battle of Maserfield known from Bede (albeit that "Canu Heledd"'s account may owe little to historical reality). Andrew Breeze has etymologised this name as a compound of the Brittonic word *"kok"- ('rock') and a personal name *"Boia", thus meaning 'hill of Boia'.