| Type | Valeur |
|---|---|
| Titre | "Honors and Knights' Fees, Volume 2," by William Farrer |
| Personnes |
|---|
Sir WILLIAM FitzWilliam I Sprotborough |
| pages 151-3 published by Manchester University Press, 1924 |
| Names the wife of William as Helewise, also names the wife of Robert his son as being Agnes. This book gives the detailed history of the Alfreton line. |