More contemporary is a record in the Coucher Book of Furness Abbey. Helewise, granddaughter and heir of William is a party, and it was asserted there that William de Lancaster I had first been known as William "de Tailboys", before receiving the right to be called ""Willelmum de Lancastre, Baronem de Kendale"". This is the only relatively contemporary evidence that William had a Taillebois connection, probably through his father Gilbert, and it also suggests that during the 12th century, Kendal was associated somehow with the honour of Lancaster, because William was described as becoming Baron of one, and taking up the title from the other. William Farrer argued that such links go back before 1066. He argued that Kendal and the neighbouring parts of Lancashire, Furness to the west, and northern Lancashire to the south, formed a single administrative district in the old Anglo-Saxon kingdom of Northumbria.