Presumably he was related to William de Blois, Bishop of Lincoln, but the exact relationship is unknown.
[citation needed] While Bishop of Worcester, William imposed particularly strict rules on Jews within the diocese in 1219.
[5] As elsewhere in England, Jews were officially compelled to wear square white badges, supposedly representing tabula.
Blois attempted to impose additional restrictions on usury, and wrote to Pope Gregory in 1229 to ask for further, harsher measures, and complaining about lack of enforcement of measures in Canterbury.
In response, the papacy demanded that Christians be prevented from working in Jewish homes, and for enforcement of the wearing of badges.