Callistus
2. Surnamed Syropulus, a Christian author who wrote a learned disputation against the Palamites, which was dedicated to the patriarch Euthymius. (Nic. Commenus, Praenot. Mystag. p. 158.)
From William Smith (ed.), Dictionary of Greek and Roman Biography and Mythology. Text provided under a CC BY-SA license by Perseus Digital Library, http://www.perseus.tufts.edu, with funding from the National Endowment for the Humanities and Tufts University. Data accessed from https://github.com/PerseusDL/canonical-pdlrefwk/ on 17 October 2026.