| 391 | Thomas Morieux of Thorpe Morieux (-) |
| 392 | Thomas of Lancaster (around 1277/80-22 March 1322), Earl of Lancaster, parents: Edmund “Crouchback” of England and Blanche d'Artois |
| 393 | Thomas of York (1450/51-young), parents: Richard of York and Cecily Neville |
| 394 | Thomas Stanley (-), Earl of Derby |
| 395 | Thomas Wake (1298-30/31 May 1349), Lord Wake |
| 396 | Tudur ap Robert Fychan of Berain (-) |
| 397 | Tudur Fychan (-September 1367), parents: Goronwy |
| 398 | Tudur Hen (-9 October 1311), parents: Goronwy ab Ednyfed and Morfyoh |
| 399 | Ursula of York (22 July 1455-young), parents: Richard of York and Cecily Neville |
| 400 | Violante Visconti (1354-November 1386) |
| 401 | Waleran de Beaumont (1104-9/10 April 1166), Comte de Meulan, parents: Robert de Beaumont-le-Roger and Isabel (Elizabeth) of Vermandois |
| 402 | Walter Devereux (-), Lord Ferrers of Chartley |
| 403 | Walter FitzWalter (-), Lord FitzWalter |
| 404 | Wilhelm I (12 May 1330-15 April 1388), joint Duke of Bavaria, parents: Ludwig IV and Marguerite II |
| 405 | William (-), parents: Henry III and Eleonore de Provence |
| 406 | William "of Hatfield" (probably 1336-before 3 March 1337), parents: Edward III and Philippa de Hainaut |
| 407 | William "of Windsor" (before 24 June 1348-before 5 September 1348), parents: Edward III and Philippa de Hainaut |
| 408 | William ap Gruffydd (-), parents: Gruffydd ab Gwilym |
| 409 | William ap Gruffydd de la Pole (-) |
| 410 | William Blount (-) |
| 411 | William Bourchier (-28 May 1420), Comte d'Eu |
| 412 | William Brandon (-) |
| 413 | William Carden (-) |
| 414 | William Courtenay (-9 June 1511), Earl of Devon |
| 415 | William de Burgh (17 September 1312-6 June 1333), 3. Earl of Ulster, parents: John de Burgh and Elizabeth de Clare |
| 416 | William Gardiner (-) |
| 417 | William Herbert (1455-16 July 1491), Earl of Huntingdon, parents: William Herbert and Anne Devereux |
| 418 | William Herbert (-), Earl of Pembroke |
| 419 | William I "the Conqueror" (probably 1027/28-9 September 1087), King of England, parents: Robert II and Herleve |
| 420 | William II “Rufus” (around 1056/60-2 August 1100), King of England, parents: William I "the Conqueror" and Mathilde de Flandre |