This small church, tucked within the urban heart of the city, was ordered built in 879 by Archbishop Anspert as a tribute to Satiro, the brother of St Ambrose. All that remains of this original basilica is the Greek-cross Cappella della Pietà. The current 15th century church is said to have been prompted by a miracle; it was reconstructed to house the votive painting of Madonna and Child, which gushed blood when attacked with a knife in 1242. The structure features Donato Bramante's barrel-vaulted nave, ending in a trompe l'œil (one of the finest in the history of art) in order to create the impression of a deep apse. Due to the presence of a main road, the space was truncated to just 97cm in length. The Borgognone frescos that once adorned the walls have since been transferred to Pinacoteca di Brera. The façade was not attached until 1872.