Righteous
Righteous Felix III of Rome (Orthodox veneration unconfirmed)
Папа Римский 483-†492
Felix III is a real historical Pope of Rome (483-492) who personally initiated the Acacian Schism — a 35-year rupture of communion between Rome and Constantinople; his veneration in the Orthodox Church is not confirmed by any primary source, consistent with his direct conflict with the Church of Constantinople.
Felix III came from the noble Roman gens Anicia and was the son of a priest; his grandson later became Pope Agapetus I, and his great-great-grandson was Pope Gregory the Great (Dvoeslov). He held the Roman see from 483 to 492. As a resolute defender of the decrees of the Council of Chalcedon, he excommunicated Patriarch Peter Mongus of Alexandria for his compromise with the Monophysites (the so-called "Henotikon" of Emperor Zeno). When Patriarch Acacius of Constantinople entered Peter Mongus's name into the church diptychs, Felix declared Acacius himself deposed and broke communion with him — thus began the Acacian Schism, which lasted until 519.
IMPORTANT CAVEAT: a thorough check of pravenc.ru (the Orthodox Encyclopedia) found NO dedicated hagiographic article on Felix III — he is mentioned only within articles on the Acacian Schism and on Pope Symmachus, strictly as a historical actor, with no honorific title "saint"/"hierarch" and no feast day. Azbyka.ru's own name-index for "Felix" lists the Orthodox saints bearing this name (Felix of Rome the martyr, Felix of Terracina, Felix of Barcelona, etc.) — Pope Felix III is ABSENT from this list. The only instance of the title "hierarch" applied to him was found in a historical scholarly work (V. L. Zadvorny, "History of the Roman Popes"), where the term reflects the Catholic (Western) veneration tradition of the source text, not Orthodox canonization. Given that this very pope personally initiated the schism with the Church of Constantinople, the absence of Orthodox veneration is expected and consistent, not a coincidental gap in sources.