Sir Roger Bertram, of Mitford, Northumberland, son and heir of Roger Bertram (a1) of the same, by Agnes, his wife (b), was born 5 December 1224. He succeeded his father in 1242, and having proved his age, he did homage and had livery of his inheritance, 28 June 1246. He had a grant of free warren in his demesne lands in Mitford, Felton, etc., 13 September 1257, but in November following, for a reason not stated, the escheator was ordered to take his lands into the Kings hand. He was sum. ciem equis et armis from 17 Jan. 1257/8) to 6 March 1263, by writs directed Rogero Bertram de Mitord. He sided with the Barons against the King, and was taken prisoner at Northampton, 3 April 1264,) but was released soon after, and fought at Lewes 14 May. He was summoned to Parliament 24 December 1264, by writ directed Rogero Bertram, which writ, however, having issued in rebellion, should not create a Peerage dignity. He alienated nearly all his extensive possessions.
He married Ida. He was living 6 March 1271/2 and died s.p.. legit. (a2), aged about 48. His widow married, before 14 April 1273 as 2nd wife, Sir Robert DE NEVILL, of Raby, co. Durham, Sheriff Hutton, Raskelf, and Sutton, co. York, Burreth and Ranby, co. Lincoln, who died in 1282. Assignment of her dower was ordered 23 October 1282 and 25 May 1283. She married, 3rdly, without licence, before 8 May 1285, as 2nd wife, Sir John FITZ MARMADUKE, of Horden and Ravensholm, co. Durham, who died shortly before 16 August 1311. She was living 18 May 1315.
He left an only child, Agnes, who was seized of Mitford and Felton, which she give to Alianore, the Queen Mother. She d. s.p., before (probably long before) 29 January 131O/ 1, when the descendants of her father's sisters were found to be his heirs. (1) Sir William fitz William, of Sprotborough and Emley co. York, son and heir of Sir William fitz Thomas, of the same son and heir of Sir Thomas fitz William, of the same (died between 1267 and 1279), by Agnes, the 1st sister. (2) Sir Philip Darcy, of Cawkwell and Coningsby, co. Lincoln (aged 40 and more in 1299), son and heir of Sir Norman D., of the same (aged 28 an(I more in 1264), son and heir of Sir Philip D., of the same, by Isabel, the 2nd sister. (3) Elias de Penulbury or Penbury, of Pendlebury, co. Lancaster, son and heir of Robert P., of the same, by Christian, the 3rd sister (she married 2ndly, Sir Robert de Ros, of Wark, who died in 1275). (4)Sir Gilbert d'Aton, son and heir of Sir William d'A., by Isabel, daughter of Sir Simon de Veer, of Goxhill, co. Lincoln, and Sproatley in Holderness (died before 3 September 1270), his 2nd wife (to whom she was sole heir), Ada, the 4th sister. On 1 June 1312, Philip Darcy did homage and had livery of one-fourth of the mill of Felton, the other 3 parts remaining in the King's hand. [Complete Peerage II:160-62, (transcribed by Dave Utzinger)]
(a1) This Roger II was son and heir of William II (by Alice, sister of Robert d'Umfraville, who gave her Great Babington in free marriage - Roger III sold it, 23 June 1262), son and heir of Roger I (by Ada, his wife), son and heir of William I, founder of Brinkburn priory (by Hawise, daughter of Guy de Balliol), who gave her Stainton in free marriage).
(b) She was living 20 Aug 1253.
(a2) Roger had a son (illegitimate), Thomas, to whom he gave the manor of Throphill.
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Roger Bertram, in the 42nd of Henry III [1258], had command with other great barons of the north to march into Scotland for the rescue of the young King of Scots, the King of England's son-in-law, out of the hands of his rebellious subjects; but, in the 48th of the same monarch [1264], being in arms with the other rebellious barons, he was taken prisoner at Northampton, and his castle of Mitford seized upon by the escheator of the crown* while he was himself committed to the custody of William de Valence. He must, however, have made his peace very soon afterwards, for we find him summoned to parliament as a Baron (the first by writ) in the next year, 14 December, 1264. His lordship had issue by Joan, his wife (who m. 2ndly, Robert de Neville),
Roger, his successor.
Agnes, m. to Thomas Fitz-William, Lord of Elmeley and Sprotborough, co. York, and had issue,
William Fitz-William, who was succeeded by his son, William FitzWilliam...
Isabel, m. to Philip Darcy, and had Norman Darcy, who was s. by his son, Philip Darcy...
Christian, m. to Penulbury, and had a son, Elias de Penulbury...
Ada, m. to --- de Vere, and had a dau., Isabel, whose son, Gilbert de Aton...
The baron was s. at his decease by his son, Roger Bertram, 2nd baron...
* The precedence of the escheator was next to the judge.
[Sir Bernard Burke, Dormant, Abeyant,Forfeited, and Extinct Peerages, Burke's Peerage, Ltd., London, 1883, p. 52, Bertram, Barons Bertram, of Mitford]
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Note: In terms of Roger's issue, Burke seems to be confused with Roger's father who m. Agnes. This Roger only had one legitimate issue, Agnes, & she died without issue. I have indications that Roger had a daughter, probably illegitimate, who m. Hugh de Eure, so I am making her the daughter by Joan mentioned by Burke above. I believe that his wife Ida was born much later than Roger, leaving a lot of time prior to the marriage for Roger to sire illegitimate children.
Note also: Magna Charta Sureties, line 118-2, has Christian Bertram, wife of Robert de Ros, as daughter of Roger & Ida. This is obviously a mistake - as Christian is daughter of Roger & Agnes.