| Type | Valeur |
|---|---|
| Titre | William de Lancaster I and Charter to St. Peter's Hospital, York |
| Personnes |
|---|
WILLIAM FitzGilbert de Lancaster Baron of Kendal and Lonsdale |
| Transactions of the Cumberland & Westmorland Antiquarian & Archaeological Society by Cumberland and Westmorland Antiquarian and Archæological Society, 1866, n.s., vol. 9 (1909) |
| Another source relating to the parentage of William de Lancaster I |