An empire with no ruins to visit: the Khazar Khaganate was the medieval world's ultimate toll booth, a steppe superpower that halted the Arab conquest's advance into Eastern Europe, ritually strangled its own kings, and stunned the world when its warrior elite converted to Judaism. One Russian historian called it a "steppe Atlantis," and from the 7th to 10th centuries it taxed everything moving between East and West.

This episode reconstructs the phantom: the 10 percent transit tax that scattered Arab silver as far as Sweden, the seven-judge multi-faith supreme court that made Atil safe for every merchant, the two-king diarchy with its barefoot prostrations and fatal initiation rituals, and the geopolitical logic behind choosing Judaism as a neutral faith between Christian Byzantium and the Islamic Caliphate. It ends with the empire's fatal ...