Isabella de Bolebec ^{1 2}

   Another name for Isabella was Isabel de Bolebec.

  Research Notes:

From: Wikipedia - Isabel de Bolebec
Isabel de Bolebec, (Isabella) countess of Oxford (c. 1165 - 1245 ) was eldest daughter and co-heiress of Hugh II de Bolebec , lord of Whitchurch , Buckinghamshire , England (d. c. 1166) and a patroness of the Order of Friars Preacher (Dominicans ) in England.

She married first Henry of Nonant (Novaunt), lord of Totnes, Devonshire (d.s.p. 1206); in 1207 she petitioned the crown for the right to marry whom she wished. That same year she married her dead niece Isabel's brother-in-law, Robert de Vere , heir to the earldom of Oxford.[1] Her only known child, Hugh de Vere (later fourth earl of Oxford), was born within the next year, and Isabel became countess of Oxford when Robert inherited the earldom from his brother in 1214.

Earl Robert joined the barons whose dissatisfaction with King John of England prompted their rebellion, and the earl was one of twenty-five barons elected by the terms of Magna Carta to ensure the king's continued good behavior. That position led to his excommunication when Pope Innocent III released John from the terms of Magna Carta, and the king took Castle Hedingham , Essex, the earl's seat, in 1216.
Robert made peace with the regents of John's son, Henry III of England , in 1217 and eventually served as a judge until his death in 1222. The widowed Countess Isabel purchased the wardship of her minor son and his inheritance for 6000 marcs. They traveled together on pilgrimage 'beyond the seas' in 1237.

Countess Isabel was one of the chief benefactors of the Dominican Order in England. She assisted the friars sent to England in 1221 to find quarters in the city of Oxford , contributing to the building of their oratory there c. 1227. When the friars needed a larger priory , she and the bishop of Carlisle bought land south of Oxford and contributed most of the funds and materials needed. She was buried in the new church there.

The countess was litigious, engaging in a number of lawsuits, including one long dispute with Woburn Abbey .

Notes
^ Her niece bore the same first and surname, Isabel de Bolebec, and also married a de Vere, Robert's brother Aubrey de Vere, 2nd earl of Oxford . That has led to confusion and difficulty separating the two women. Isabel the younger had died by 1207, and her aunts Isabel and Constance were her co-heirs.


Sources
Oxford Dictionary of National Biography, "Isabel de Bolebec."
Complete Peerage, "Robert De Vere, 3rd earl of Oxford", vol. X, 211-213, X:210-3
Survey of the Antiquities of the city of Oxford...by Anthony Wood (Oxford Historical Society, 1890)
Ancestral Roots of Certain American Colonists Who Came to America Before 1700 by Frederick Lewis Weis, Lines: 50-29, 60-28, 246-27, 267-27
Magna Charta Sureties 1215 by Frederick Lewis Weis, Page: 120-1, 154-3
Burke's Peerage & Baronetage by John Burke, Page: 2498
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Isabella married Henry of Nonant Lord of Totnes, Devonshire. (Henry of Nonant Lord of Totnes, Devonshire died in 1206.)

Isabella next married Robert de Vere 3rd Earl of Oxford, son of Aubrey III de Vere 1st Earl of Oxford and Count of Guînes and Agnes of Essex, in 1207. (Robert de Vere 3rd Earl of Oxford was born in 1164 in Essex, England, christened in 1164, died before 25 Oct 1221 in England and was buried in Hatfield Regis Priory.)