Walter, Mórmaer of Glenbervie

also known as Walter de Lens de Bedford

http://www2.thesetonfamily.com:8080/history/The_Early_Setons.htm

The Early Seton Family

As their own distinctive crescents show, Seier de Seton (I) and his brother Walter sprang from a second son of the house of Boulogne. Known in their Flemish homeland as Seier and Walter de Lens, they were sons of Count Eustace I ’s second son, Count Lambert de Lens, whose daughter by a second marriage (to the sister of William the Conqueror) was the Countess Judith, mother of Scotland’s Queen Maud.

Count Lambert died when the boys were too young to administer to the important estate of Lens, and thus they followed the Flemish military contingent into England with their half-sister's husband, Duke William of Normandy, in his quest for the English crown and settled there in the north following William's success. Count Lambert himself was the second son of his father, Eustace I of Boulogne, and brother of Eustace II, and they were lineally descended in both Eustace I’s mother and father from King Charles I, Charlemagne, Holy Roman Emperor and the first of the Carolingian Empire.