This is another memento from the time when Bolgar became one huge graveyard. This was when the Golden Horde prince Bulat-Timur was through with the city in 1361. Khan’s burial vault is a complex of four mausoleums. It is assumed that the north-western one was a memorial mosque, not a vault, since it has remnants of a stove and heating conduits.
It is believed that one of the associates (sakhab) of the Prophet Moha.m.med, Zubair bin Talqe, was buried here. The Prophet allegedly gave him a headscarf, a walking cane and an inkwell, and sent him and two other sakhabs to Bulgaria. Zubair married Khan’s daughter Tuibike and settled down in Bulgaria. The statue next to the vault is a reminder of this legend.