Hierarch
Bishop Faustus of Riez (Orthodox veneration unconfirmed)
ок. 405 — †ок. 490-495
Faustus of Riez — a real historical monk of the Lérins community, later bishop of the city of Riez (Regium) in Gaul from 458/459, author of the theological treatise "On Grace," a key text of semi-Pelagianism (a doctrine later condemned at the Second Council of Orange in 529); his veneration in the Orthodox Church is not confirmed by any primary source.
Faustus was a monk, and later abbot, of the renowned monastic community of Lérins in southern Gaul; around 458/459 he was elevated to the episcopal see of the city of Riez (Regium, modern Riez, France). As a theologian he is known chiefly for the treatise "On Grace" (De gratia), in which he defended the so-called "semi-Pelagian" position — the teaching that a person takes the first step toward faith by their own effort, with grace assisting only afterward; this position conflicted with Blessed Augustine's teaching on the absolute priority of grace. He died around 490-495. Faustus's teaching was formally condemned at the Council of Orange in 529 — after his death, but still within the era of the undivided Church.
IMPORTANT CAVEAT: a targeted check of azbyka.ru, drevo-info.ru, and pravenc.ru found no individual hagiography page or feast day for Faustus of Riez in the Orthodox calendar; pravenc.ru mentions him only as a polemical theologian within an article on Claudianus Mamertus, without giving a commemoration date. The only source citing a veneration date (September 28) is a private modern Greek compilation (the Great Synaxaristes of Hieromonk Makarios of Simonopetra), not an official church calendar. A complicating factor is that his semi-Pelagian doctrine was itself condemned by the Church. This entry is marked as a real historical figure with unconfirmed Orthodox veneration.