They landed at Genoa, and Nazarius decided that they ought to try once more to convert the people of Milan. But the magistrates of Milan again caught Nazarius and Celsus with him. This time they were beheaded.
The two saints were buried outside the walls of the city, close by the graves of Gervase and Protase. Saint Ambrose, bishop of Milan, discovered the four bodies in a garden outside Milan and reverently enshrined them inside his great new church of the Apostles in 395. Reputedly, Nazarius's blood was still liquid and red when his body was exhumed by Saint Ambrose.
The faithful stained handkerchiefs with some drops, and also formed a certain paste with it, a portion of which St. Ambrose sent to St. Gaudentius, Bishop of Brescia. St. Ambrose conveyed the bodies of the two martyrs into the new church of the apostles, which he had just built. A woman was delivered of an evil spirit in their presence. St. Ambrose sent some of these relics to St. Paulinus of Nola, who received them, with great respect, as a most valuable present, as he testifies.