Санта-Мария-ин-Трастевере
Callixtus was buried in the cemetery of Calepodius on the Aurelian Way and his anniversary is given by the 4th-century "Depositio Martirum" and by subsequent martyrologies on 14 October. The Catholic Church celebrates his optional memorial on 14 October. His relics were transferred in the 9th century to Santa Maria in Trastevere.