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The Marcosians were a Gnostic sect founded by Marcus, founded in Lyon, France and active in southern Europe from the 2nd to the 4th century.
Women held special status in the marcosian communities; they were regarded as prophetesses and participated in administering the Eucharistic rites. Irenaeus accuses Marcus of seducing his followers, and scornfully writes (Adversus Haereses I. 13, 4) that the whole sect was an affair of "silly women."
The marcosian system was a variation of that of Valentinus. It retained the 30 Aeons, but called them "Greatnesses" and gave them numerical values. It kept the myth of the fall of Sophia but called it a "Divine Deficiency". Unique to it was the adaptation of the Pythagorean number theory (Isopsephy) to Gnosticism.