Theudas was allegedly the name of a Christian Gnostic thinker, who was a follower of Paul the Apostle. He went on to teach the Gnostic Valentinus. The only evidence of this connection is the testimony of Valentinius' followers and Clement of Alexandria.

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It has been proposed that he was the Theudas mentioned in the Bible, but it is unlikely, as the latter would have been dead before Valentinus's birth.