Chrysanthus and Daria were a married couple of third-century Rome who, by mutual consent, preserved their virginity throughout their marriage and were martyred together under the emperor Numerian. They are commemorated on March 19 in the Eastern Church, and they are honored together with a wider company who suffered with them, including the tribune Claudius and his wife Hilaria, their sons Maurus and Jason, the presbyter Diodorus, and the deacon Marianus.
By tradition, Chrysanthus was the son of a patrician family of Egyptian (Alexandrian) origin that had settled in Rome, where he received an elite education. After encountering Christian teaching he sought out the Scriptures, and the synaxarion relates that he was baptized by a presbyter named Carpophorus, after which he began to preach the Gospel. His father, hoping to turn him from the faith, arranged his marriage to Daria, described as a pagan priestess; instead of being drawn back to paganism, Chrysanthus converted Daria to Christianity, and the two agreed to live together in continence.
The couple's preaching drew many Romans to the faith and, according to the accounts, to a life of celibacy, which provoked complaint to the Roman authorities. Chrysanthus was handed over for torture to the tribune Claudius, whose own conversion, together with that of his wife Hilaria, their sons, and a body of his soldiers, followed from witnessing the saint's constancy. Numerian ordered the converts put to death, and Chrysanthus and Daria were finally buried alive. The tradition adds that Christians who gathered at a cave near the place of execution to commemorate the martyrs were themselves sealed within it and died, among them the presbyter Diodorus and the deacon Marianus.