He [William FitzOsbern] married, 2ndly shortly before his death, Richilde, widow of Baldwin (VI), COUNT OF FLANDERS, and previously, as is stated, of Herman, COUNT OF HAINAULT, daughter and heir of the Count of Egisheim [Alsace]. The Earl died as aforesaid in 1071, and was buried in the Abbey of Cormeilles, which he had also founded. His widow appears to have died 15 March 1086/7. She was buried with her 2nd husband in the Abbey of Hasnon, which they had founded. [Complete Peerage VI:447-9, XIV:380, (transcribed by Dave Utzinger)]