Nanni sculpted the group called Quattro Santi Coronati for his own guild, the Arte dei Maestri di Pietra and Legname (Guild of the Stone and Woodcutters). The life-size figures arranged in a semi-circle represent Claudius, Castor, Symphorian and Nicostratus, four Christian sculptors who refused to execute a statue of Aesculapius for the Emperor Diocletian; they were confused with Christian soldiers, were martyred for not venerating the Emperor and were worshipped as the Quattro Coronati.
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