Cerdo (Ancient Greek: Κέρδων) was a Syrian Gnostic who was deemed a heretic by the Early Church around the time of his teaching, circa 138 AD. Cerdo started out as a follower of Simon Magus, like Basilides and Saturninus, and taught at about the same time as Valentinus and Marcion. According to Irenaeus, he was a contemporary of the Roman bishop Hyginus, residing in Rome as a prominent member of the Church until his forced expulsion therefrom.
He taught that there were two gods, one that demanded obedience while the other was good and merciful. According to Cerdo, the former was the God of the Old Testament who had created the world. He also said that the latter God was superior but that he was only known through his son, Jesus. Like later Gnostics, he was a docetist who rejected the bodily resurrection of the dead.
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