Why ancient Greeks and Romans saw their own gods in every foreign deity

Ideas & Philosophy · Published 3 October 2026 · Updated 22 October 2026 Swipe more like this →

In short: The ancient world was a polytheistic melting pot where gods were international. By mapping foreign deities onto their own familiar pantheons, Greeks and Romans created a common language of belief. This practice, known as interpretatio, allowed diverse cultures to communicate, though it sparked violent resistance when applied to monotheism.

Interpretatio graeca, or 'Greek translation,' was a comparative methodology used by ancient Greeks to understand foreign religions through their own familiar concepts. By identifying shared traits or functions, they could effectively translate the names and characters of foreign gods into Greek terms. This practice was not merely a linguistic exercise but a way to articulate a common semantic universe, fostering the idea that gods were international figures who simply went by different names in different lands.

The Romans adopted this approach as interpretatio romana, often using it to integrate the religious traditions of conquered peoples, such as the Gauls, into the Imperial framework. While some pairings, like Zeus and Jupiter, likely stemmed from a shared Indo-European archetype, others were more creative. For instance, Tacitus documented the identification of the divine Alcis with Castor and Pollux, while other Roman scholars attempted to map the Jewish God onto figures like Jupiter or Saturn. This syncretism was possible because polytheistic systems were inherently non-dogmatic and expansive, allowing for overlapping powers and multiple, even contradictory, functions within a single deity.

However, this interpretive lens hit a hard wall when it encountered Jewish monotheism. Unlike other cultures that accepted or adapted to these identifications, the Jews viewed the attempt to equate their God with pagan deities as the ultimate sacrilege. This fundamental clash of worldviews became a significant source of friction within the Roman Empire. The tension culminated in events like the Bar Kokhba revolt, which was precipitated by Emperor Hadrian’s decision to rebuild Jerusalem as a city dedicated to Jupiter, a move that ignored the unique, non-translatable nature of the Jewish faith.

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