Question: Who is the paternal grandfather of Richard Beauchamp, 1St Earl Of Worcester?

Knowledge 1: Richard Beauchamp, 1st Earl of Worcester
Richard de Beauchamp, 1st Earl of Worcester, KCB (c. 1394 – c. 18 March 1421/1422) was an English peer.The only son of William de Beauchamp, 1st Baron Bergavenny, he succeeded as 2nd Baron Bergavenny at the death of his father on 8 May 1411.On 27 July 1411, he married Lady Isabel le Despenser, daughter of Thomas le Despenser, 1st Earl of Gloucester, and great-granddaughter of Edward III.They had one child, Lady Elizabeth de Beauchamp, later 3rd Baroness Bergavenny, who married Sir Edward Neville, later 1st Baron Bergavenny.He was joint Warden of the Welsh Marches in 1415, and a captain of lances and archers in Normandy in 1418.In February 1420/1, he was created Earl of Worcester.Worcester was mortally wounded on 18 March 1421/2 at the Siege of Meaux and died soon after.His body was taken back to England and he was buried on 25 April 1422 at Tewkesbury, Gloucestershire.His daughter inherited his estates and his barony of Bergavenny, although the castle and honour of Abergavenny were still held by her grandmother in dower. [SEP] Knowledge 2: William Beauchamp, 1st Baron Bergavenny
William de Beauchamp, 1st Baron Bergavenny, KG(c. 1343 – 8 May 1411) was an English peer.Beauchamp was the fourth son of Thomas de Beauchamp, 11th Earl of Warwick, and Katherine Mortimer.He served under Sir John Chandos during the Hundred Years' War, and was created a Knight of the Garter in 1376.He served as Captain of Calais in 1383.Upon the death of his first cousin once removed, John Hastings, 3rd Earl of Pembroke on 30 December 1389, William inherited the lordship of Abergavenny, including Abergavenny Castle.He was summoned to Parliament on 23 July 1392 as "Willilmo Beauchamp de Bergavenny", by which he is held to have become Baron Bergavenny, a barony by writ.In 1399, he was appointed Justiciar of South Wales and Governor of Pembroke.He entailed the castle and Honour of Abergavenny on the issue male of his body, with remainder to his brother Thomas de Beauchamp, 12th Earl of Warwick and his heirs male; his wife enjoyed it in dower until her death in 1435.Bergavenny died in 1411 and was buried at Black Friars, Hereford.
Knowledge 1: Richard Beauchamp, 1st Earl of Worcester
Richard de Beauchamp, 1st Earl of Worcester, KCB (c. 1394 – c. 18 March 1421/1422) was an English peer.The only son of William de Beauchamp, 1st Baron Bergavenny, he succeeded as 2nd Baron Bergavenny at the death of his father on 8 May 1411.On 27 July 1411, he married Lady Isabel le Despenser, daughter of Thomas le Despenser, 1st Earl of Gloucester, and great-granddaughter of Edward III.They had one child, Lady Elizabeth de Beauchamp, later 3rd Baroness Bergavenny, who married Sir Edward Neville, later 1st Baron Bergavenny.He was joint Warden of the Welsh Marches in 1415, and a captain of lances and archers in Normandy in 1418.In February 1420/1, he was created Earl of Worcester.Worcester was mortally wounded on 18 March 1421/2 at the Siege of Meaux and died soon after.His body was taken back to England and he was buried on 25 April 1422 at Tewkesbury, Gloucestershire.His daughter inherited his estates and his barony of Bergavenny, although the castle and honour of Abergavenny were still held by her grandmother in dower. [SEP] Knowledge 2: Richard (III), bishop of Bayeux
Richard of Gloucester was a bishop of Bayeux in France.Also called Richard Fitz Robert, he was the bastard son of Robert, 1st Earl of Gloucester, and Isabel of Dover, daughter of Samson of Worcester, Bishop of Worcester.He was the nephew of Richard de Douvres, his predecessor at the bishopric of Bayeux.
Knowledge 1: Richard Beauchamp, 1st Earl of Worcester
Richard de Beauchamp, 1st Earl of Worcester, KCB (c. 1394 – c. 18 March 1421/1422) was an English peer.The only son of William de Beauchamp, 1st Baron Bergavenny, he succeeded as 2nd Baron Bergavenny at the death of his father on 8 May 1411.On 27 July 1411, he married Lady Isabel le Despenser, daughter of Thomas le Despenser, 1st Earl of Gloucester, and great-granddaughter of Edward III.They had one child, Lady Elizabeth de Beauchamp, later 3rd Baroness Bergavenny, who married Sir Edward Neville, later 1st Baron Bergavenny.He was joint Warden of the Welsh Marches in 1415, and a captain of lances and archers in Normandy in 1418.In February 1420/1, he was created Earl of Worcester.Worcester was mortally wounded on 18 March 1421/2 at the Siege of Meaux and died soon after.His body was taken back to England and he was buried on 25 April 1422 at Tewkesbury, Gloucestershire.His daughter inherited his estates and his barony of Bergavenny, although the castle and honour of Abergavenny were still held by her grandmother in dower. [SEP] Knowledge 2: Joan FitzAlan, Baroness Bergavenny
Joan de Beauchamp, Baroness Bergavenny( née FitzAlan; 1375 – 14 November 1435) was an English noblewoman, and the wife of William de Beauchamp, 1st Baron Bergavenny of the Welsh Marches.

Answer: Thomas de Beauchamp