 
| Type | Valeur | 
|---|---|
| Titre | Parentage of William de Lancaster and The Chartulary of Cockersand Abbery | 
| 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, pp 306-308 |