The attribution of the Speculum Astronomiae to Albertus Magnus became a controversial issue only recently, when the great neo-Thomist historian Pierre Mandonnet suggested -- without any antecedents -- that the author was Roger Bacon rather than Albert. Mandonnet's theses were refuted by Lynn Thorndike and have since then been the subject of widespread discussion. The present historiographical case-study considers this debate in the light of an analysis of texts by Albert himself, as well as other important authors, such as Bacon, Bonaventura, Thomas Aquinas, Witelo, Campanus of Novara, and others, which shows how widespread the general concept of the influence of the stars and other astrological ideas to be found in the Speculum were. Most of the scientific ideas of the Middle Ages were based on principles derived from the notion of celestial influence and its consequences. The Speculum drew the fundamental outlines of this discipline into a theoretical and bibliographical introduction -- no small achievement -- and was consequently greeted with great interest and used as a standard reference book for many centuries. Set against the background of discussions taking place in the 1260s, within the Dominican Order as well as in the Faculties of Arts, Zambelli removes all doubt that the Speculum was written by Albert, possibly with some collaboration.

The Priapeia is a collection of ninety-five poems in various meters on subjects pertaining to the phallic god Priapus. It was compiled from literary works and inscriptions on images of the god by an unknown editor, who composed the introductory epigram. From their style and versification it is evident that the poems belong to the classical period of Latin literature. Some, however, may be interpolations of a later period. These poems were posted upon statues of Priapus that stood in the midst of gardens as the protector of the fruits that grew therein. These statues were often crude carvings made from tree trunks. They roughly resembled the form of a man with a huge phallus. The statues also promoted the gardens' fertility. The verses are attributed variously to Virgil, Ovid, and Domitius Marsus. However, most authorities on the matter regard them to have been the work of a group of poets who met at the house of Maecenas, amusing themselves by writing tongue-in-cheek tributes to the garden Priapus. (Maecenas was Horace's patron.) Others, including Martial and Petronius, were thought to have added more verses in imitation of the originals.