Built by ST. AMBROSE between 379-386,is one of the most ancient churces in the city.The first name of the church was Basilica Martyrum,many martyrs of the Roman persecutions had been buried here.In the crypt 3 corps of the saints lies,one is naturally ST.AMBROSE dressed in white pontifical robes,on the sides there are ST.GERVASIUS and ST. PROTASIUS with gold suplices,red dalmatics,golden crown with palm branches.