MS 133 is intriguing, as it seems to be the unique surviving manuscript of Leonini of Padua's Decas Loyca, although it is still only a part of the full text. Augustinian friar Leonino of Padua is first mentioned in 1332, holding a post at an annual meeting of the Augustinian Order in Venice. By 1360 he had become a Doctor of Theology as was teaching in Padua. His Decas Loyca was written probably in the late 1350s, in which he criticises the 'modern logic' of the 14th century. Another manuscript copy of this text by Leonino was known to have existed in the Augustian library in Padua in the 17th century. That now lost copy bears ownership marks of two brothers from their time studying theology at Padua in the 1350s. They both became noted Augustinian theologians in their own rights, and had close connections with the famous humanist Petrarch. As Anthony Luttrel noted in a short 1968 article on Leonino's Decas Loyca (of which MS 133 is the sole survivor), was probably meant as a textbook, without much significance as a text itself. However, it is also the one surviving work of this professor of theology, and a testament to the endurance of the 'old disciplines' alongside the new, with the work of Petrarch and the beginning of the Renaissance in 14th century Padua.

The text starts on f. 1r with the following words: Incipit decas Loyca Magistri Leonini de Padua fratrum Heremitarum ordinis Sancti Augustini sacre Pagine dignissimi Professoris..., and ends with: de omni vel de ullo procedere est inscripta prius forma et efficacia sill[ogism]i expositorii. on f. 33v.

The hand is fair Italian Gothic, the smaller initials being blue and red filigree, while initials of books are floriated on square burnished gold grounds with gold balls in margin.

The first initial has the figure of a black monk at a desk expounding to a class of monks from a book, and there is a floriated border round three sides of this page.