 One of Ranulf 's brothers was Fulcher , who was Bishop of Lisieux in 1101 . Another brother was Osbern , who was a royal clerk for Rufus , and the last brother was Geoffrey . Fulcher may have been appointed bishop to enable Ranulf to exploit the see while Ranulf was in exile in Normandy . Ranulf had a son , Thomas , who also held the see of Lisieux , right after his uncle . Like his uncle , he may have been appointed as a placeholder to allow his father to appropriate the revenues of Lisieux . Ranulf 's mistress was an Englishwoman named Alveva or Ælfgifu , who was the mother of at least two of his sons . Alveva 's sons were Ranulf , who was an archdeacon , and Elias . When Ranulf became bishop , he married her to a burgess of Huntingdon , but remained on good terms with both Alveva and her spouse , often staying with them when he travelled away from Durham . Alveva was the aunt of Christina of Markyate , and Christina is said to have rebuffed the bishop 's attempts to seduce her in 1114 . Alveva and Ranulf 's son Elias held a prebend at London and was a royal clerk under Henry I. Ranulf 's son Ralf was parson of Middleham and held a prebend at London too . He was a member of Archbishop Theobald of Canterbury 's household after 1138 . Some of Ranulf 's sons were educated at Laon under William de Corbeil , who was one of Ranulf 's clerks . One of Ranulf 's nephews , Ralf , was archdeacon of Northumberland and during the reign of King Stephen helped to hold the diocese of Durham loyal to Stephen . Other nephews were Osbert , who was sheriff of Durham , and Robert , Richard , and William who held fiefs . Unrelated to Ranulf , William of Corbeil became one of Ranulf 's household clerks , and was eventually to be elected Archbishop of Canterbury in 1123 . 
