SIR ROBERT FITZPAYN, formerly DE GREY, younger son of Sir Richard DE GREY, of Codnor, co. Derby [LORD GREY], by Joan, daughter of Sir Robert FITZPAYN [LORD FITZPAYN], by Isabel, his wife. He was b. about 1321. He married, between 16 August 1351 and 16 October 1354, Elizabeth, daughter, and in her issue coheir of Sir Guy DE BRIENE, of Laugharne, co. Carmarthen, and Walwyn's Castle, co. Pembroke [LORD BRIENE], by his 1st wife, Joan, daughter (it is said) of Sir John DE CARREU, of Carew, co. Pembroke. On the death of his uncle, Sir Robert FitzPayn, in 1354, he and his wife, Elizabeth, inherited the manors and advowsons of Cheddon Fitzpaine, Staple Fitzpaine, Charlton Mackrell, and Cary Fitzpaine, Somerset, and Wraxall, Dorset, by virtue of the fine levied in 28 Edw. III. On 20 December 1354 they had livery of the manors and advowsons of Charlton and Cary, his homage being respited, as he was then in the King's service with Guy de Briene in parts beyond seas, and the rest of the premises were liberated to them the same day. On the death of Ela FitzPayn, he inherited the manors and advowsons of Stogursey and Rodway, Somerset, and Okeford Fitzpaine, Dorset, with the hundred of Cannington, Somerset, by virtue of the fines levied in 17 Edw. II. On 6 Mar. 1355/6, he had livery of the premises in Somerset, and the manor and advowson of Okeford were liberated to him the same day. In 1359 he and Elizabeth, his wife, conveyed the manors of Wraxall and Stourton to John de Veer, Earl of Oxford, and Maud, his wife, for the life of Maud, at a rent of 200s. a year, with reversion to himself and Elizabeth, and his heirs. He was with the King in the invasion of France, October 1359 to 1360, in the retinue of Sir Guy de Briene. He died s.p.m., 21 May 1393. His wife predeceased him. [Complete Peerage V:463-4, (transcribed by Dave Utzinger)]
His heir was his daughter, Isabel, aged 28 and more, or 30 and more, in 1393, and then widow of Sir Richard Ponynges, of Poynings, West Dean, Waldron, and Hangleton, Sussex, Tirlingham, Kent, Wrentham, Suffolk, &c., sometimes called Lord Ponynges, who died 25 May 1387 at Villalpando in the Kingdom of Leon, and whose will, directing his burial to be in the parish church of Poynings, was dated 10 June 1387 [sic, for 1386], with a codicil, dated at Plymouth 1 June [no year added and proved at Mayfield, 26 September 1387. She had livery of her father's lands, 19 July 1393, her homage and fealty being respited. The King took her homage, 17 February 1393 /4. She died 11 April 1394, leaving Robert Ponynges, her son and heir, who was born at Okeford Fitzpaine, Wednesday after St. Andrew [3 December 1382, and baptized there.
Complete Peerage of England Scotland Ireland Great Britain and the United Kingdom, by G. E Cokayne, Sutton Publishing Ltd, 2000
Page: V:463-4