St. Praxedes was a sister of St. Prudentiana, whose feast is celebrated on May 19th. She was the daughter of the Roman Senator Prudens, and after consecrating her virginity to God; she gave up all her wealth to the poor.
Pope Paschal I transferred the bodies of many saints from the catacombs and placed their relics in the Church of St. Praxedes; an inscription states that 2,300 bodies of saints repose in the crypt under the apse of the Church.
(Source: The New Roman Missal, Rev. F. X. Lasance)