Righteous
Righteous Leo III of Rome
Identity not confirmed: no widespread Orthodox veneration of Pope Leo III of Rome (795-816, who crowned Charlemagne emperor) was found in any authoritative source.
The historical Pope Leo III (pontificate 795-816) is known chiefly for crowning Charlemagne with the imperial crown on Christmas Day 800 — an act closely tied to the growing ecclesiastical-political rift between East and West, since it directly rivaled the Byzantine emperors' claim to the sole legitimate imperial title.
Thorough verification found no widespread Orthodox veneration of this figure. Neither the saints database of the official website of the Orthodox Church in America (OCA), nor the calendar of the Greek Archdiocese (GOARCH), nor the leading Russian-language calendar resources (days.pravoslavie.ru, azbyka.ru, obitel-minsk.ru, tatmitropolia.ru) contain a separate article on a "Leo III" as a saint distinct from Leo I. Even the Orthodox Encyclopedia (pravenc.ru), which has a separate article on him, marks him only with the note "пам. зап. 12 июня" (Western commemoration, added to the Roman Martyrology only in 1673) and presents the article as a historical-political sketch rather than hagiography. The only source insisting on his veneration as a saint is a marginal, non-mainstream website.
Given the absence of confirmed church-wide veneration of this figure in any authoritative source, the entry has been unpublished without inventing biographical facts, a feast date, or a liturgical category.