'''Gregory Protopsaltes the Byzantios''' , also '''Gregory Byzantios Protopsaltis''' or '''Gregorios Byzantios Protopsaltis''', was a [[Lampadarios|Lambadarios]] and Archcantor of the [[Hagia Sophia (Constantinople)|Great Church]] of Constantinople during the decades of the turn of the eighteenth and nineteenth centuries. He was a musical genius, musician, and teacher of music.