High Quality Content by WIKIPEDIA articles! Gregory of Nazianzus (c. 329 – January 25 389 or 390) (also known as Gregory the Theologian or Gregory Nazianzen) was a 4th-century Archbishop of Constantinople. He is widely considered the most accomplished rhetorical stylist of the patristic age.:xxi As a classically trained speaker and philosopher he infused Hellenism into the early church, establishing the paradigm of Byzantine theologians and church officials.:xxiv