This is an incunabula leaf from the "Summa Angelica de Casibus Conscientiae" written by Angelus de Clavasio. The "Summa" is divided into six hundred and fifty-nine articles arranged in alphabetical order and forming what would now be called a dictionary of moral theology. Angelus (b.1411- d.1495 ) was a theologian of the order of Friars Minor who held the title of both Doctor of Civil and Cannon Law and the offices of vicar-general of Cismontane Observance and Apostolic Nuncio under Pope Sixtus IV. Georgius Arrivabenus printed it on June 4 1492 at Venice from a first edition printed in 1476 and it underwent 31 editions into the 16th century. The octavo size leaf measures 150 x 115 mm. in totality and contain 44 lines of gothic type (17:58G, 27:110G) printed double column in Latin. The verso contains the same amount of lines, type & layout. (Hain 5396, Proctor 4922, Oates 1931, GW 1934)

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