Emerentiana was also later canonised. The daughter of Constantine I, Constantina, was said to have been cured of leprosy after praying at Agnes' tomb. She and Emerentiana appear in the scenes from the life of Agnes on the 14th-century Royal Gold Cup in the British Museum. An early account of Agnes' death, stressing her young age, steadfastness and virginity, but not the legendary features of the tradition, is given by Ambrose. Agnes was venerated as a saint at least as early as the time of St Ambrose, based on an existing homily. She is commemorated in the "Depositio Martyrum" of Filocalus (354) and in the early Roman Sacramentaries. Agnes' bones are conserved beneath the high altar in the church of Sant'Agnese fuori le mura in Rome, built over the catacomb that housed her tomb. Her skull is preserved in a separate chapel in the church of Sant'Agnese in Agone in Rome's Piazza Navona. Her feast day is 21 January. Because of the legend around her martyrdom, she is patron saint of those seeking chastity and purity. Agnes is also the patron saint of young girls. Folk custom called for them to practise rituals on Saint Agnes' Eve (20–21 January) with a view to discovering their future husbands. This superstition has been immortalised in John Keats's poem, "The Eve of Saint Agnes". Since the Middle Ages, Agnes has traditionally been depicted as a young girl in robes, with a lamb, the symbol of her virginal innocence, and often, like many other martyrs, with a palm branch. The Congregation of Sisters of St. Agnes is a Roman Catholic religious community for women based in Fond du Lac, Wisconsin, USA. It was founded in 1858, by Father Caspar Rehrl, an Austrian missionary, who established the sisterhood of pioneer women under the patronage of Agnes, to whom he had a particular devotion. It is customary on her feast day for two lambs to be brought from the Trappist abbey of Tre Fontane in Rome to the Sant'Agnese in Agone church to be blessed by the Pope. On Holy Thursday they are shorn, and from the wool is woven the pallium which the pope gives to a newly consecrated metropolitan archbishop as a sign of his jurisdiction and his union with the pope.