| William Beauchamp,|
January 8, 1411
| Thomas de Beauchamp, 11th Earl of Warwick|
Thomas de Beauchamp, 11th Earl of Warwick's son
Joan FitzAlan, Baroness Bergavenny
Richard de Beauchamp, 1st Earl of Worcester, Joan de Beauchamp, Countess of Ormond
Thomas de Beauchamp, 12th Earl of Warwick, Philippa de Beauchamp, Alice Beauchamp, Baroness Beauchamp
Katherine Mortimer, Countess of Warwick, Thomas de Beauchamp, 11th Earl of Warwick
Richard Beauchamp - 13th Earl, Roger Mortimer - 1st Earl of, Thomas Butler - 7th Earl of Or
William de Beauchamp, 1st Baron Bergavenny Wikipedia
William de Beauchamp, 1st Baron Bergavenny, KG (c. 1343 – 8 May 1411) was an English peer.
A younger son of Thomas de Beauchamp, 11th Earl of Warwick, and Katherine Mortimer, he was summoned to Parliament on 23 July 1392 as "Willilmo Beauchamp de Bergavenny", by which he is held to have become Baron Bergavenny.
On 23 July 1392, he married Lady Joan FitzAlan, daughter of Richard FitzAlan, 11th Earl of Arundel, and Elizabeth de Bohun, and they had the following children:Richard de Beauchamp, 1st Earl of Worcester, 2nd Baron Bergavenny (born before 1397 – died 1422), married Isabel le Despenser, daughter of Thomas le Despenser, 1st Earl of Gloucester and Constance of York, by whom he had one daughter Elizabeth de Beauchamp, Baroness Bergavenny.
Joan de Beauchamp (1396 – 3 August 1430), married 28 August 1413 James Butler, 4th Earl of Ormond, son of James Butler, 3rd Earl of Ormond and Anne Welles, by whom she had five children, including Thomas Butler, 7th Earl of Ormond. Anne Boleyn and Mary Boleyn were notable descendants.