Castulus was a civil servant and chamberlain serving Emperor Diocletian in Rome during the late third century. While performing his duties, he secretly provided shelter to Christians within his residence and organized religious services for them in the imperial palace. Alongside his companion Tiburtius, he successfully converted numerous individuals to the faith. His activities eventually led to his betrayal by an apostate named Torquatus, resulting in his execution in 286.
Life and martyrdom
Serving in the imperial court, Castulus utilized his position to support the Christian community. Following his discovery by Torquatus, he was martyred on the Via Labicana. His death was carried out through the method of being buried alive in a sand pit. He was the husband of Irene of Rome.
Veneration and legacy
A church was established at the site of his martyrdom. His relics were later transferred to Moosburg, where construction on the Kastulus Minster began in 1171. These remains have also been held in Landshut and Prague. He is commemorated on March 26 in the Anglican, Catholic, and Orthodox traditions.