The Crypt of Abbot Martin is located in Church of the Saints Vitale and Agricola. It is the oldest church of the Abbazia Di Santo Stefano. This basilica-shaped church, without a transept, with a salient façade and triconca apse, is dedicated to the patron saints Vitale and Agricola and since its construction it housed the relics of the two saints, respectively servant and master, the first two martyrs from Bologna times of Diocletian (305 AD). In 393 the remains are moved from Ambrogio to be taken to Milan and also in the fifth century a messenger was sent by Namazio, bishop of Clermont, to have relics of the Bolognese protomartyrs.