Oxford, Bodley, Laud. Misc. 587, fol. 59r
Pope Alexander III and Emperor Fredrick I Barbarossa

M.L. Rampolla, "Alexander III, Pope," Dictionary of the Middle Ages vol. 1 (1982) 146: "The first great lawyer pope .  .  . A professor of canon law at Bologna."

J.N.D Kelly, The Oxford Dictionary of Popes (Oxford 1986) 176: "celebrated professor of law at Bologna .  .  . author of a commentary on the 12th-century canonist Gratian and of theological sentences."

Marcel Pacaut, "Alexander III," The Papacy: An Encyclopedia (New York-London 2002) 1.19: "Bandinelli studied canon law attentively and his professor at the School of Bologna was no doubt the celebrated Gratian."