Bertram of Northumberland, England
Sir Richard Bertram, Knight, b abt 1068, of Northumberland, England. He md Sybilla de
Mitford abt 1090, daughter of Sir John de Mitford, Lord of Mitford. She was b abt 1074.
Child of Richard Bertram and Sybilla de Mitford was:

Sir William Bertram [a], Lord of Mitford, b abt 1096, of Mitford, Northumberland, England, d aft 1152. He md Hawise de Baliol abt 1122, daughter of Guy de Baliol and Denise.
Child of William Bertram and Hawise de Baliol was:

Sir Roger Bertram, Lord of Mitford, b abt 1128, of Mitford, Northumberland, England, d 1177. He md Ada abt 1250. She was b abt 1134.
Child of Roger Bertram and Ada was:

Sir William Bertram [b], Lord of Mitford, b abt 1156, of Mitford, Northumberland, England, d abt 1205. He md Alice de Umfreville abt 1180, daughter of Odinel de Umfreville and Alice de Lucy.
Child of William Bertram and Alice de Umfreville was:

Roger Bertram [c] b abt 1188, of Mitford, Northumberland, England, d 1241/42. He md Agnes abt 1212. She was b abt 1196, d aft Aug 1233.
Children of Roger Bertram and Agnes were:
  • Christian Bertram b abt 1216, of Mitford, Northumberland, England. She md [1] Unknown de Penulbury, and [2] Sir Robert de Ros abt 1240, son of Sir Robert de Ros, Magna Carta Surety, Knight Templar, and Isabel of Scotland.
  • Roger Bertram b 5 Dec 1224, d abt 1272; md Ida.
  • Isabel Bertram b abt 1226, of Mitford, Northumberland, England. She md Sir Philip Darcy, Lord of Knayth, abt 1240, son of Sir Norman Darcy and Agnes.
NOTES:
a. From his wife, Hawise, daughter of Guy de Baliol, he received Stainton in free marriage.

b. He was founder of Brinkburn Priory, and from his wife, Alice, sister of Robert de Umfreville, he received Great Babington in free marriage. This property was later sold by Roger Bertram, son of Roger and Agnes.

c. His son and heir was Roger Bertram, who by his wife Ida, left an only child, Agnes, who was siezed of Mitford and Felton, which she gave to Alianore, the Queen Mother. Agnes died well before 1310/11, when the descendants of her father's four sisters were found to be his heirs: (2) Agnes (married Sir Thomas Fitz William), (2) Isabel (married Sir Philip Darcy), (3) Christian (married first, unknown de Penulbury, second Sir Robert de Ros), and (4) Ada (married Sir William d'Aton). Note that Magna Charta Sureties, Line 118, is in error when stating that Christian Bertram was the daughter of Roger and Ida; as put forth by the above statement of heirs from Complete Peerage, she was the aunt of Roger who married Ida.
SOURCES:
CP Vol II [160, and footnote (a)].
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