Mezue ahịrịokwu na-esonụ: Genghis Khan nwere khatun (eze nwanyị) Merged aha ya bụ Khulan. Ọ nwụrụ mgbe ndị agha Mongol nọchibidoro ebe obibi nke Kievan Rus na Ryazan na 1236. Na 1236, n'oge
Na mbuso agha ndị Mongol nke Volga Bulgaria, a hụrụ ozu ndị Merkit n'ógbè ala nke ndị Bulgarian na Kipchak na-achị.