Kingdom of Lindsey

[2] Lindsey lay between the Humber estuary and the Wash, forming its inland boundaries from the courses of the Witham and Trent rivers, and the Foss Dyke between them.

Toby Martin and Catherine Hills identify Lindsey as an area in which large-scale settlement by the Angles occurred.

[5][6] However, a continuing British presence in the region is indicated by the fact that major settlements such as Lincoln, and Lindsey itself, have partially Celtic names.

Its territories were absorbed into the historical English county of Lincolnshire, the northern part of which is called Lindsey.

The Anglian collection of genealogies, which was created in the last years of the reign of Offa of Mercia, gives a pedigree for Aldfrið, presumed to have been ruler of Lindsey.

With regard to Aldfrið, Frank Stenton referred to the witness list for a charter which includes an "Ealfrid rex", and dated its writing to some time between the years 787 and 796.

[8] Scholars now believe that the name on the witness list should read "Ecgfrið Rex", and refers to Offa's son.