See also

• William Plantagenet's parents: Edward Plantagenet - King Edward III (1312-1377) and Philippa of Hainault (1314-1369)
• William Plantagenet's siblings: Edward Plantagenet - The Black Prince (1330-1376), Isabella Plantagenet (1332- ), Joan Plantagenet (1333- ), Lionel Plantagenet (1338- ), John Plantagenet of Gaunt, 1st Duke of Lancaster (1340-1399), Edmund Plantagenet of Langley, 1st Duke of York (1341- ), Blanche Plantagenet (1342- ), Mary Plantagenet (1344- ), Margaret Plantagenet (1346- ), Thomas Plantagenet of Windsor (1347-1348) and Thomas Plantagenet - 1st Duke of Gloucester (1355-1397)