The northenmost province of Lincolnshire, this petty Anglo-Saxon kingdom was absorbed into Northumbria in the seventh century. Its name means 'Island of Lincoln'.
In Renaut de Bâgé’s Le Bel Inconnu, one of the Yvains is noted as the King of Lindsey. Pierre de Langtoft gives it as Lot’s kingdom, which is usually Lothian. Nennius may mean Lindsey when he places four of Arthur’s battles against the Saxons in Linnuis.