A region of Britain that contained the river Dubglas where, according to Nennius, Arthur won four battles against the Saxons (see Arthur’s Battles). It may be identical to Lindsey in Lincolnshire, though no river called Dubglas is known here. Other possibilities are Lothian, which has a river Dunglas, and Lindum in Scotland, which has a river Douglas, though these would be too far north for a fifth-century campaign against the Saxons. Nennius may be preserving some memory of a battle against the Picts instead.