Henry's canonists had done their research well and discovered the couple were related to each other.[17] William Clito and Sibyl of Anjou were related in the fifth degree of consanguinity (they were fourth cousins).[16] During this period in time canon law prohibited any marriage within seven degrees of consanguinity (sixth cousins).[18] But the marriage of Henry's son, William Adelin and Matilda of Anjou had been in the same prohibited degree of consanguinity.[19]
"This princess took the veil at Fontevraud in 1128, became abbess of that monastery in 1150, and died in 1154.[23] Taking the veil meant becoming a nun. Henry I, her former father-in-law visited her at Fontevraud from time to time.