The Jews' guilt of the crucifixion of Jesus consigned them to perpetual servitude, and, like Cain, they are to be wanderers and fugitives. The Jews will not dare to raise their necks, bowed under the yoke of perpetual slavery, against the reverence of the Christian faith.
Pope Innocent IIIWe believe that the Greeks have been punished through [the Crusades] by the just judgement of God: these Greeks who have striven to rend the Seamless Robe of Jesus Christ ... Those who would not join Noah in his ark perished justly in the deluge; and these have justly suffered famine and hunger who would not receive as their shepherd the blessed Peter, Prince of the Apostles.
Pope Innocent IIIEvery cleric must obey the Pope, even if he commands what is evil; for no one may judge the Pope.
Pope Innocent III