Pope Callixtus I

Pope Saint Callixtus I or Callistus I (217-222 C.E.) was the sixteenth Pope, the official title is the Bishop of Rome of the Catholic Church, during the reigns of the Roman Emperors Elagabalus and Alexander Severus. He is considered a saint of the Roman Catholic Church.
He was a slave of a Christian who had educated him. He went into business but the business failed. After some trouble, he was sent to the mines in Sardinia but was freed due to the efforts of Pope Victor I. Callistus went to work for Pope Zephrynus and became a great influence upon him.
He was a very unpopular pope to the theologians of the day.
His tomb was discovered in 1960 in the cemetary of Calepodius and can be seen even today. His feast day is celebrated on October 14.