"Colomba was in opposition to the person of the Pope precisely out of loyalty to the institution of the Papacy."
— Bryan Houghton, Mitre and Crook, 1978, p. 35.
But:
"He may be a saint but an impossible Pope, as was Celestine V. He may be a sinner but a good Pope, as was Alexander VI."
— Ibid., p. 159.
