Yahweh
Graeco-Roman syncretism

Yahweh is frequently invoked in Graeco-Roman magical texts dating from the 2nd century BCE to the 5th century CE, most notably in the Greek Magical Papyri, under the names Iao, Adonai, Sabaoth, and Eloai. In these texts, he is often mentioned alongside traditional Graeco-Roman deities and Egyptian deities. The archangels Michael, Gabriel, Raphael, and Ouriel and Jewish cultural heroes such as Abraham, Jacob, and Moses are also invoked frequently. The frequent occurrence of Yahweh's name was likely due to Greek and Roman folk magicians seeking to make their spells more powerful through the invocation of a prestigious foreign deity.

A coin issued by Pompey to celebrate his successful conquest of Judaea showed a kneeling, bearded figure grasping a branch (a common Roman symbol of submission) subtitled BACCHIVS IVDAEVS, which may be translated as either "The Jewish Bacchus " or "Bacchus the Judaean". The figure has been interpreted as depicting Yahweh as a local variety of Bacchus, that is, Dionysus. However, as coins minted with such iconography ordinarily depicted subjected persons, and not the gods of a subjected people, some have assumed the coin simply depicts the surrender of a Judean who was called "Bacchius", sometimes identified as the Hasmonean king Aristobulus II, who was overthrown by Pompey's campaign.

In any event, Tacitus, John the Lydian, Cornelius Labeo, and Marcus Terentius Varro similarly identify Yahweh with Bacchus–Dionysus. Jews themselves frequently used symbols that were also associated with Dionysus such as kylixes, amphorae, leaves of ivy, and clusters of grapes, a similarity Plutarch used to argue that Jews worshipped a hypostasized form of Bacchus–Dionysus. In his Quaestiones Convivales, Plutarch further notes that the Jews hail their god with cries of " Euoi " and " Sabi ", phrases associated with the worship of Dionysus. According to Sean M. McDonough, Greek speakers may have confused Aramaic words such as Sabbath, Alleluia, or even possibly some variant of the name Yahweh itself, for more familiar terms associated with Dionysus.

Other Roman writers, such as Juvenal, Petronius, and Florus, identified Yahweh with the god Caelus.
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