On 21 May at the Bolgar Islamic Academy, Tatarstan President Rustam Minnikhanov, the State Counselor of the republic Mintimer Shaimiev, Russian Deputy Minister of Culture-the Secretary of the Federal Committee on celebrations of the 100th anniversary Olga Yarilova took part in a ceremony of cancelling a memorial post stamp dedicated to the 1100th anniversary of the adoption of Islam by the Volga Bulgaria