Known in Egypt as the protector god of Alexandria, whose sanctuary was apparently founded by Alexander himself. The oldest evidence for his cult is a passage from the Potters' oracle (130 BC) where Agathos Daimon is identified with the primeval snake Kneph. For the rest, the cult was confined to Alexandria and is only known from the Roman Period. The worship of the Agathos Daimon as a protective house snake appears to have a Greek origin. Further, he mainly appears in Greek literature.