Prepon an early Marcionite, was a native of Assyria, and flourished at the close of the 2nd century. The Marcionites were then divided into several factions, some of which admitted two original principles, as Potitus and Basilicus; others three (Rhodon, in Eusebius, Hist. Ecclesiastes 5, 13). To the latter belonged Prepon, who held that, besides what is good and evil, there is what constitutes a third principle, viz. what is just. This intermediate principle Hippolytus identifies with the "Musa," or impartial Reason of Empedocles, a myth to whom is attributed the restoration to the good power Unity of what is disturbed by the wicked power Discord (Hippol. Haer. Refut. 7:19). A letter from Prepon to the Armenian Bardesanes is mentioned (Philos. I. 8:253).