A region of Britain that contained the river Dubglas (Douglas) where, according to Nennius, Arthur won four battles against the Saxons.

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.

It might be identical with the Battle of Lincoln.