Introduction
John FitzRobert (ca. 1190–1240) (de Clavering) is listed as one of the Surety Barons in Magna Carta (1215) where he is described as Lord of Warkworth Castle. He was the son of Robert fitzRoger and Margaret Chesney.
Life
In 1213 and 1215 John served as the sheriff of Norfolk and Suffolk. With the renewal of hostilities in the autumn of 1215 he joined the barons in waging war against King John of England. After the baronial defeat at Lincoln in May, hesubmitted to King Henry III of England's minority government.He served as the sheriff of Northumberland from 1224 to 1227.
Marriage and issue
He married Ada, ca. 1218, a daughter of Hugh de Balliol and Cecily de Fontaines. His son Roger FitzJohn, Lord of Warkworth, married Isabel de Dunbar daughter of Patrick II, Earl of Dunbar.His daughter Cecily married Patrick III, Earl of Dunbar. He was also the father of a son Hugh de Eure from whom the Lords Eure descend and Robert de Eure, ancestor of the Eures of Axholm.