Dionysius of Alexandria, patriarch from 348, a disciple of Origen, and his most illustrious pupil; a firm but judicious defender of the faith against the heretics of the time, in particular the Sabellians and the Chiliasts; (d. 264).
Definition taken from The Nuttall Encyclopædia, edited by the Reverend James Wood (1907)
Dionysius the Younger * Dionysius, St., the Areopagite