Canon 22 issued by the Council of Rome [Italy] [Unconfirmed]
Commentary from other sources:
1) “Rome (1078) Gregory VII convoked this council, to which he invited the French bishops as well, with the declared object of finding a solution to the conflict between the papacy and the empire. It opened in the Lateran, on 19 November 1078. Only twelve canons promulgated by that council have been transmitted in their entirety, the rest being known only by their titles; canon 22, dealing with the Jews, is among the latter…[c.22]…That Jews should not be appointed over Christians.”
Linder, Amnon: “The Jews in the Legal Sources of the Early Middle Ages.” pp. 558-559