CATHOLIC ENCYCLOPEDIA: Pope St. Celestine I Nothing is known of his early history except that he was a Roman and that his
father's name was Priscus. He is said to have lived for a time at Milan with St.
Ambrose; the first notice, however, concerning him that is known is in a
document of St. Innocent I, in the year 416, where he is spoken of as Celestine
the Deacon. In 418 St. Augustine wrote to him (Epist., lxii) in very reverential
language. [eng]