St Gregory of Nazianzus
/ˌnazɪˈanzəs
/ (329–89), Doctor of the Church, bishop of Constantinople. With St Basil and St Gregory of Nyssa he was an upholder of Orthodoxy against the Arian and Apollinarian heresies, and influential in restoring adherence to the Nicene Creed. Feast day, (in the Eastern Church) 25 and 30 January; (in the Western Church) 2 January (formerly 9 May).