End of IXth c – Beginning of Xth c – appearance of Volzhskaya Bulgaria.
922 AD – adoption of Islam by Volzhskaya Bulgaria.
985 AD – Bulgaria and Russia enter into a trade agreement.
At the turn of X-XIth c (approximately 1005) – founding of Kazan city subordinated to Volzhskaya Bulgaria.
1212 – the first literary monument that remains “Legend of Yousuf”.
1236 – Volzhskaya Bulgaria is conquested by Batiy army.
Last quarter of XIIth c – the first stone walls of the city were put up.
1266-1282 – governance of Mengu-Timur khan under which Ulus Djuchi became an independent state. | 
