Silvia Donghi

SUMMARY: In Milan two different liturgical rites have been practiced side by side in the late Middle Ages: the peculiar Ambrosian liturgy and the Roman liturgy, followed in convents and monasteries of regular orders inside the city. The MS Milano, Bibl. Ambrosiana, A 12 sup. is an important witness of this situation. Written in Italy in the early 14th century, this MS was later owned by the convent of S. Agostino in Cremona, Lombardy. In the 17th century, with a faked bookplate, it was included in a collection of MSS (about a hundred) sold by a forger as part of Petrarch’s library. It contains sermons mostly of Hugues de Saint-Cher OP, of Jean Bale ´trier OP, of Siboto OP and other authors. The sermons cover all the liturgical year and few feasts of the sanctoral, following the Roman liturgy and kalendar. The unique feature of this MS is a Kapitulare Epistularum and Evangeliorum for the temporale according to the Ambrosian rite, appended at the end by one of its early users. This sort of index of the biblical passages read during the Mass is concluded with comments on the differences between the Ambrosian and the Roman kalendars and rites.