Heresiarch
From BiblePortal Wikipedia
Charles Buck Theological Dictionary [1]
Of arch heretic, the founder or inventor of an heresy; or a chief of a sect of heretics.
Webster's Dictionary [2]
(n.) A leader in heresy; the chief of a sect of heretics.
Cyclopedia of Biblical, Theological and Ecclesiastical Literature [3]
a leader in heresy, founder of a sect of heretics. (See Heresy).
