It ended with the destruction of Bilär and the massacre of its population, estimated at several dozen thousand.
By the materials uncovered by archaeological excavations, the city was burnt after falling, and the unburied remains of its population were found all over Bilär.
The excavations prove the Kazan Tatar legends and the Russian chronicles, which wrote that the Mongols: …взяша славный Великий город Болгарьский и избиша оружием от старца и до унаго и до сущаго младенца, и взяша товара множества, а город пожгоша огнем, и всю землю их плениша.…took the glorious Great city of Bolghar and massacred everybody, from monks to babies, and took many goods and set fire to the city and captivated their land.Then, the Mongols destroyed many Bulgarian cities, but the country's north remained intact, so many survivors resettled to the North and the West from the Bulgarian mainland.
The country was incorporated into the Ulus Jochi, but the resistance lasted forty years.
Some years after the fall of Bilär, Bolghars tried to revive the Great City, but this attempt had no result.