Sir Thomas de Furnival, b. ca. 1270, d. 1332, 1st Lord Furnival, of Worksop, co. Nottingham, and Sheffield, Co. York; m. (1) by Jan 1272/3, Joan le Despenser, d. ca. 1322, daughter of Sir Hugh le Despenser, b. 1223, d. 1265, Justiciar of England, of Loughborough and Arnesby, co. Leicester., by wife Aline, b. 1246, d. 1281, daughter & heir of Sir Philip Basset, d. 1272, Justiciar of England, of Wycombe, co. Buckingham, and Wootton Basset, co. Wilts, by (1) wife, Hawise, daughter of Sir Matthew de Lovaine. [Ancestral Roots]
Note: I am not sure at all about the "b. ca. 1270". The reason that Thomas inherited in 1291 was because that was the year his father died, not the year he came of age. He was a minor when married in 1272/3, but probably more than 3 years old.
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Sir Thomas de Furnivall(e), 1st Lord (Baron) Furinvall(e), so created by writ of summons to Parliament 24 June 1295; fought at Battle of Falkirk against the Scots 1298; married 1st by Jan 1272/3 Joan, daughter of 1st Lord (Baron) le Despenser of the putative 1264 creation, and had [Thomas, Catherine, Eleanor]. The 1st Lord (Baron) Furnivall(e) married 2nd by 8 June 1322 Elizabeth (died Aug 1354), widow of 2nd Lord (Baron) Montagu of the 1299 creation and daughter of Sir Piers de Mo(u)ntfort, of Beaudesert, Warwicks, and died just prior to 18 April 1332, having had another son William, whether by his 1st or 2nd wife is unknown. [Burke's Peerage]
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BARONY OF FURNIVALLE (I, 2)
SIR THOMAS DE FURNIVALLE, of Sheffield, Worksop, Grassthorpe, &c., son and heir. On 5 June 1291 the King took his homage, and he had livery of his father's lands. He was at the battle of Falkirk 22 July 1298. He was summoned for Military Service from May 1297 to 5 April 1327, to attend the King wherever he might be, 8 June 1294, to attend the King at Salisbury, 26 January 1296/7, to a Military Council, 16 September 1297, to attend theCoronation, 18 January 1307/8, to Councils from 30 December 1324I to 20 November 1331, and to Parliament from 24 June 1295 to 27 January 1331/2, by writs directed Thome de Furnivall' or de Fournivall' (with the addition, on and after 25 August 1318, of seniori), whereby he is held to have become LORD FURNIVALLE. As Thomas de Furnivall' dominus de Shefeld' he took part in the Barons' Letter to the Pope, 12 February 1300/1.
He married, 1stly, before January 1272/3 (at which date he was a minor), Joan, daughter of Sir Hugh LE DESPENSER, of Ryhall, Rutland, Loughborough, co. Leicester, Parlington, co. York, &c., sometime justiciar of England, by Aline, daughter and heir of Sir Philip BASSET, of Wycombe, Bucks, &c., also justiciar of England. He married, 2ndly (pardon for marrying without royal licence, 8 June 1322, for a fine of £200), Elizabeth, widow of Sir William DE MOUNTAGU, Of Shepton Montagu, Somerset, Aston Clinton,, Bucks, &c. [LORD MOUNTAGU] (who died 18 October 1319), and daughter of Sir Piers DE MOUNTFORTof Beaudesert, co. Warwick, by Maud, daughter and heir of Matthew DE LA MARE. On 13 April 1325 he had licence to convey the manors of Sheffield, Worksop, Grassthorpe, Eyam, and Brassington, to himself for life, with remainders to Thomas and William his sons, in successive tail general, remainder to his own right heirs. He died shortly before 18 April 1332. On 6 June 1332 his widow had livery of her dower, and of the knights' fees and advowsons of her dower, all of which had been assigned to her by the King. She died in August 1354, and was buried in the Priory of St. Frideswide (now Christ Church), Oxford. [Complete Peerage V:581-2, XIV:332 (transcribed by Dave Utzinger)]
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Following copied from Susan Cary, World Connect db=poliksa, rootsweb.com:
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Thomas de Furnival, 1st Baron Furnival, who had a summons, in the 22nd of Edward I, amongst other great men, to attend the King in order to advise of the affairs of the realm, and having done so, received command to repair to Portsmouth, upon the first of the ensuing September, well fitted with horse and arms, for the expedition then intended against France. In the next year, 23 June, 1295, he was first summoned to Parliament as a baron, and from that period his lordship appears, for several years, to have taken a distinguished part in the Scottish wars. In 27th of Edward I he was constituted Captain-General and Lieutenant to the King, for the Counties of Nottingham and Derby, and had summons to Parliament uninterruptedly until 27 January, 1332, 3rd of Edward III, but he did not hold lands by barony. Lord Furnival married Elizabeth, daughter of Peter de Montfort, Jr., of Beldesert Castle, County Warwick, and was succeeded at his decease by his eldest son, Thomas.