A new study suggests that the ancient Persian religion of Zoroastrianism influenced Jewish communities living under the Achaemenid Empire. The research, published in the journal Iran, provides evidence that Zoroastrian religious ideas and practices reached regions far beyond the Persian heartland.

The study was conducted by researcher Gad Barnea, who analyzed historical records preserved in Jewish archives from areas governed by the Persian Empire. These documents offer new insight into how religious traditions interacted during a time when diverse cultures lived under a single imperial system.

The Achaemenid Empire was founded by Cyrus the Great in the sixth century BC and later fell to Alexander the Great in the fourth century BC. At its height, the empire controlled vast territories stretching from Egypt to Central Asia. Scholars generally agree that the Achaemenid rulers practiced a form of Zoroastrianism, one of the world’s oldest monotheistic religions.

Jewish records reveal traces of Zoroastrian traditions

Understanding how Zoroastrian beliefs influenced other cultures remains challenging because direct evidence is limited. Researchers often rely on clues from royal inscriptions, administrative archives, personal names, and archaeological discoveries such as seals, reliefs, and coins.

Barnea’s research focuses on documents discovered at Elephantine, an island in the Nile River in Upper Egypt that hosted a Jewish community during the Persian period. Archaeologists have uncovered hundreds of papyri at the site, including official letters, contracts, and personal correspondence.

“My early study of the religious climate at Elephantine during the Achaemenid period pointed to a deep symbiosis of cultic systems in a deeply cosmopolitan society,” Barnea said.

Several documents from the region show possible signs of Zoroastrian influence. A red sandstone stela found in nearby Aswan and dated to about 458 BC refers to a structure that appears linked to Zoroastrian-style worship.

Personal names preserved in the Elephantine archives also contain elements tied to Zoroastrian theology. Some refer to concepts such as cosmic truth, sacred fire, and protective spiritual forces—central ideas in Zoroastrian belief.

Evidence of fire altar traditions in a Jewish temple

One of the most striking discoveries comes from a damaged papyrus dated to around 410 BC. The document describes violence inflicted on the Jewish temple at Elephantine and lists offerings made to the Jewish God.

Among these offerings appears a reference to a brazier called ātārudān. Barnea argues that this term reflects a specialized Zoroastrian word connected to a sacred fire altar. The term closely resembles Ātašdān, the Avestan word used for a fire altar in Zoroastrian ritual practice.

The presence of this object suggests that the Jewish community may have incorporated certain Zoroastrian-style ritual elements into its temple complex.

However, Barnea stresses that this does not indicate religious conversion. Instead, it reflects cultural adaptation within the political and social environment of the Persian Empire.

Cultural exchange across the Achaemenid world

Barnea notes that Elephantine was not unique. Evidence from other regions of the empire—including Judea, Samaria, and Babylonia—also shows signs of interaction between Zoroastrian traditions and early Jewish practices.

Coins from these areas sometimes carry Jewish names alongside graphic elements linked to Zoroastrian symbolism. Historical records also show Jewish individuals adopting official names with Zoroastrian religious characteristics.

According to Barnea, these examples illustrate the close cultural contact between Persian religious traditions and the Judaism practiced in communities under imperial rule.

Researchers say this interaction occurred during the same period when sections of the Hebrew Bible were being written, edited, and transmitted. The findings, therefore, offer new perspectives on how religious ideas moved and evolved across the ancient Near East.