==Sources==* Thomas, P. C., "A Compact History of the Popes", St Pauls BYB, 2007* Mann, Horace K., "The Lives of the Popes in the Middle Ages, Vol 9" (1925)==References==
*Mann, Horace K., The Lives of the Popes in the Middle Ages, Vol 9 (1925)*Thomas, P. C., A Compact History of the Popes, St Pauls BYB, 2007