'''Eustathius of Sebaste''' was a [[bishop]] during the mid fourth century controversies associated with [[Arianism]]. Originally a disciple of the [[heretic]] [[Arius]], his position wavered through the various shades of Arianism: Arian, [[Semi-Arianism|semi-Arian]], anomoen, and even the [[Nicene-Constantinopolitan Creed|Nicene]] faith. A [[monk]], he advocated an exaggerated form of [[asceticism|ascetic]] [[monasticism]] that he brought to Armenia.