 
| Type | Valeur | 
|---|---|
| Titre | Roderick W. Stuart, Royalty for Commoners, The complete known Lineage of John of Gaunt, Son of Edward III, King of England, and Queen Philippa; Genealogical Publishing Company; 4 edition (January 28, 2010) | 
| Personnes | 
|---|
|  GERBERGE of Lorraine CR003 (Vermandois) |