His masterpiece, Libri octo de synodo diocesana, begun in Bologna, appeared during his pontificate.
A didactic poem from his pen, De octo vitiis principalibus, is printed in Haupt's Zeitschrift fur deutsches Alterthum (vol.
Among his works, which were first collectively published in 1867-1876, are Absolutissimus de octo orationis partium constructione libellus (Antwerp, 1530), Rudimenta Grammatices (London, 1539), Daily Devotions, Monition to a Godly Life, Epistolae ad Erasmum, and commentaries on different parts of the Bible.
A papal diploma, still extant, shows that Count Borel and Bishop Octo or Otho of Ausona were at Rome in January 971, and, as all the other indications point to a corresponding year, enables us to fix the chronology of Gerbert's later life.
In his writing Super potestate summi pontificis octo quaestionum decisions (1339-1342) Occam attacks the temporal supremacy of the pope, insists on the independence of kingly authority, which he maintains is as much an ordinance of.