chasuble from her son's treasury, which she instructed the bishop to wear only during Marian festivals. In part because of the vision, Rome later elevated Toledo's status to the metropolitan see of Carthaginiensis, with the most authority in the Iberian Peninsula. Death and legacy Ildefonsus died after a decade in office and was buried at his (and the city's) basilica, Toledo's Church of Santa Leocadia. Another Council of Toledo decreed that henceforth 18 December would be celebrated as a Marian feast day, to commemorate his vision, although some sources claim that feast day was added to the calendar during the 10th Council (where Ildefonsus had served as a reporter), along with the Feast of the Annunciation on 25 March. Even during the Muslim occupation, when the basilica was converted into a mosque, the area where the vision occurred remained sacred and dedicated to the Virgin Mary. Pilgrims travelled to Toledo to see the stone where Mary stepped during Ildefonsus' vision. During later wars, Ildefonsus' remains were transferred to Zamora, where they remain at the Church of Sts. Peter and Ildefonso. Quiricus, the dedicatee of Ildefonsus' De perpetua virginitate, succeeded him as bishop. His later successor, Julian, included Ildefonsus among the biographies added in his own continuation to the De viris illustribus. Another successor, Cixila, wrote a hagiographical life of Ildefonsus. During the 13th century, the Dominican Rodrigo de Cerrato included Ildefonsus among his vignettes of illustrious men. Ildefonsus is considered a patron saint of Toledo, Zamora, and several smaller towns. His feast day is 23 January, the date of his death. In Olula del Río (Almería), festivities begin with a bonfire and fireworks the previous night, and continue with a traditional procession of the saint's image with bread being tossed onto onlookers. Iberian missionaries promoted San Ildefonso worldwide, including the San Ildefonso Peninsula and municipalities San Ildefonso, Bulacan, Patron Saint of Tanay, Rizal and San Ildefonso, Ilocos Sur in the Philippines, San Ildefonso Ixtahuacán in Guatemala, San Ildefonso, San Vicente in El Salvador and San Ildefonso Pueblo, New Mexico. Theology and writings Some consider Ildefonsus the source of common Spanish allusions to Mary as "the Virgin" rather than "Our Lady" per French or "the Lady" in Italian practice. Ildefonsus' most important work was his De perpetua virginitate Mariae contra tres infideles, which imitated an earlier work by Jerome, and became the center of Spanish Marian theology. The three heretics reflected