Dionysus-Osiris

The two deities had been identified with each other as early as the 5th century BC, as recounted in the Histories of Herodotus:[1] For no gods are worshipped by all Egyptians in common except Isis and Osiris, who they say is Dionysus; these are worshipped by all alike.

Other syncretic deities arose from these Egyptian-Greek conflations, including Serapis and Hermanubis.

[2] This association was most notable during a deification ceremony where Mark Antony became Dionysus-Osiris, alongside Cleopatra as Isis-Aphrodite.

[3] In the controversial book The Jesus Mysteries, Osiris-Dionysus is claimed to be the basis of Jesus as a syncretic dying-and-rising god, with early Christianity beginning as a Greco-Roman mystery.

[4] The book and its "Jesus Mysteries thesis" have not been accepted by mainstream scholarship, with Bart Ehrman stating that the work is unscholarly.