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Marcus Gnosticus/Marcosians
(1,183 words)

Marcus “the Magician” is described by Irenaeus of Lyon (Haer. 1.13–15 or 16) as a Valentinian teacher and leader of a community. Later sources are all dependent on Irenaeus; only Hipp. Haer. 6.39–54 offers some additional information on the Marcosians, probably based on oral sources and his own observations (Förster, 1999, 7–53, 153–158). It should be noted that Irenaeus’ report on Marcus and his followers does not extend beyond chapter…

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Thomassen, Einar, “Marcus Gnosticus/Marcosians”, in: Brill Encyclopedia of Early Christianity Online, General Editor David G. Hunter, Paul J.J. van Geest, Bert Jan Lietaert Peerbolte. Consulted online on 08 December 2023 <>
First published online: 2018

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