Introduction

The underground Mithras temple at Zerzevan Castle in southeastern Turkey has long fascinated archaeologists as one of the most intact sanctuaries linked to a Roman military garrison. Recent research has uncovered a remarkable Aramaic inscription that documents how early Christians symbolically sealed the temple around 1,700 years ago, offering direct evidence of the religious shift from Mithraism to Christianity within the Roman Empire.

Discovery and Decipherment

Excavations at the castle’s entrance to the Mithras sanctuary revealed an ancient inscription that had remained unread since its discovery in 2017. Professor Mehmet Sait Toprak, head of the Syriac language and literature department at Mardin Artuklu University, spent a year examining the letter forms and linguistic features of the text. By comparing the inscription with Old Syriac and Aramaic examples from the second and third centuries A.D., he dated the carving to the third or fourth century and successfully interpreted its meaning.

The inscription, accompanied by a carved cross at the temple doorway, explicitly references the “Invincible Sun God Mithras” and Jesus Christ, and mentions the Holy Cross in the name of God. This combination of symbols indicates a deliberate, symbolic closure of the Mithraic sanctuary by the emerging Christian community.

Religious Transition on the Empire’s Frontier

Mithraism, a mystery religion centered on the deity Mithras, flourished among Roman soldiers during the second and third centuries A.D. As the empire embraced Christianity, the once‑popular cult began to wane. The Zerzevan inscription provides the first known Old Aramaic record that documents this transformation, showing that early Christians not only abandoned the Mithras temple but also performed a formal sealing ritual, signaling the dominance of the new faith.

Excavation director Professor Aytaç Coşkun noted that previous coin finds had hinted at the temple’s abandonment, but the newly deciphered text offers concrete proof of why the sanctuary was closed. Some Mithraic sites were repurposed as churches, while others, like the Zerzevan temple, were deliberately sealed to mark the end of their ritual use.

Significance for History and Archaeology

The find enriches our understanding of how religious change manifested on Rome’s eastern frontier. It fills a long‑standing gap in the historical record by providing written evidence of the systematic closure of a Mithraic sanctuary following the empire‑wide rise of Christianity.

Zerzevan Castle itself, excavated since 2014, features defensive walls, towers, churches, storage rooms, and the underground Mithras temple. The site was added to UNESCO’s World Heritage Tentative List in 2020 and has become a key archaeological attraction in southeastern Turkey. The inscription underscores the castle’s role as a focal point for both pagan and Christian worship during a pivotal era of cultural transition.

Conclusion

The Aramaic inscription at Zerzevan Castle stands as a powerful testament to the early Christian community’s commitment to shaping the religious landscape of the Roman Empire. By sealing the Mithras temple, these believers not only marked the end of an ancient cult but also heralded the rise of Christianity as the dominant faith—a transformation that would shape the destiny of the region for centuries to come.