Some scholars postulate that the Russians borrowed onion domes from Muslim countries, possibly from the Khanate of Kazan, the siege of kazan in 1552 was the final Battle of Russo-Kazan Wars. In 1552, during the Siege of Kazan mosque called Qul Sharif Mosque was destroyed by Ivan the Terrible, It is believe that onion domes first appeared in that mosque and Some believe that it origin from Russian wooden architecture above tent-like churches. According to this theory, onion domes were strictly utilitarian, as they prevented snow from piling on the roof.