The Basilica di San Pietro was the first cathedral of the Christian era, then transformed into a tomb of Saint Sabino (556), patron of Canosa. The complex is with three naves, apse and narthex of St. Peter's, preceded by a large atrium portico and bordered by a residential building and several other structures used in cemetery functions: a mausoleum, the Sepulchre of Bishop Sabino, a large brick kiln devoted to cooking and a domus, used probably as a bishop's residence.