From BiblePortal Wikipedia

Callistus [1]

is the name of several persons in early church history. (See Calixtus).

1. A deacon who accused pope Damasus of adultery, and was expelled from the Church by the Council of Aquileia.

2. Praefect of Egypt, killed by his servants, Sept., 422, to which event a passage of Cyril's homily, the next, Easter, is supposed, by Tillemont (xiv, 282), to refer.

3. Son of a Roman praefect, and the subject of a miracle of healing in the legendary Life Of Epiphanius (ii, 337).

4. With Carisius and seven others, martyrs at Corinth, commemorated April 16.