An open list of 19 words by sionnach.
- arianism was added by sionnach and appears on 5 other lists
- pelagianism was added by sionnach and appears on just this list
- lollards was added by sionnach and appears on just this list
- manichæans. was added by sionnach and appears on just this list
- quietism was added by johnmperry and appears on 10 other lists
- latitudinarian was added by johnmperry and appears on 25 other lists
- nestorianism was added by sionnach and appears on 1 other list
- monophysites was added by sionnach and appears on just this list
- eutychianism was added by sionnach and appears on 2 other lists
- lutheranism was added by sionnach and appears on 1 other list
- wycliffites was added by sionnach and appears on just this list
- encratites was added by sionnach and appears on just this list
- gnostics was added by sionnach and appears on just this list
- hutterites was added by sionnach and appears on 1 other list
- huguenots was added by sionnach and appears on just this list
- hussites was added by sionnach and appears on 1 other list
- calvinism was added by sionnach and appears on 5 other lists
- torquemada was added by sionnach and appears on 1 other list
- cathars was added by ruzuzu and appears on 1 other list

asativum Well, there's also the Hussites, led by Jan Hus. Some others: the Albigensianism (a form of Dualism), Docetism, Gnosticism.
But this could get dicey. I remember once asking an amateur Catholic historian about heresies, and he said: "Oh, like the Presbyterians?"
Maybe stick with pre-Reformation heresies, though even that might get sticky when you get to concepts like Nestorianism... Jan 22, 2008