Wikipedia
Calepodius
Calepodius was the name of a 4th-century bishop of Naples.
Saint Calepodius (died 232 AD) was a priest who was killed during the persecutions of Christians by the Roman Emperor Alexander Severus. One of the catacombs of Rome, the cemetery of Calepodius on the Aurelian Way, was named after him.
His Hagiography recalls that he was tortured and then thrown into the Tiber river with a mill stone tied round his neck.