• Relics of the Quattro Coronati, traditionally named as Severus, Victorinus, Carpophorus, and Severinus, are found in the crypt. They were martyred by Diocletian (284-305) for not worshiping a statue of the pagan god Asclepius

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• Relics of the Five sculptors of Pannonia, traditionally named Claudius, Nicostratus, Castor, Sempronianus, and Simplicius, are also found in the crypt. They were martyred for not making a sculpture of the pagan god Asclepius

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• You can access the crypt at the ends of the transcepts