 
| Type | Valeur | 
|---|---|
| Titre | The Genealogy of William de Lancaster | 
| Personnes | 
|---|
|  WILLIAM FitzGilbert de Lancaster Baron of Kendal and Lonsdale | 
| The chartulary of Cockersand abbey of the Premonstratensian order by Cockersand Abbey; Farrer, William, ed, 1898, Publisher [Manchester] Printed for the Chetham society | 
| pages 305 to 308 refutes the descent of William de Lancaster from Ivo Tailebois |