This church is, after St. Ambrogio, the most noteworthy medieval Milanese edifice. It rises in the square of same name in the modestly picturesque neighborhood of Porta Ticinese. It was started in the 4th century and rebuilt in Romanesque style in the 11th century.
The interior has recently been restored under the supervision of the superintendent of historical place. In the right transept is the Chapel of the Three Kings. Its sacred relics were taken away by Emperor Frederick I “Barbarossa”. A part of them were returned in 1903. Behind the apse is the Portinari chapel, a jewel of Renaissance architecture. The walls are decorated with frescos by Vincenzo Foppa. In the center of the chapel is the very beautiful 14th century marble tomb consecrated to the Dominican friar, Pietro da Verona.