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| Saint, a.d. c160–222, Italian ecclesiastic: pope 218–222. |
Calixtus I, Saint
pope from 217? to 222, during the schism of St. Hippolytus, the church's first antipope. Little was known about Calixtus before the discovery of Philosophumena by Hippolytus, a work that is, in part, a pamphlet directed against him.
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