The Qolsarif mosque, also spelled Kul Sharif located in Kazan Kremlin, was reputed to be -at the time of its construction- the largest mosque in Russia, and in Europe outside of Istanbul.
Originally, the mosque was built in the Kazan Kremlin in the 16th century. It was named after Qolsarif who served there. Qolsharif died with his numerous students while defending Kazan from Russian forces in 1552. It is believed that the building featured minarets, both in the form of cupolas and tents. Its design was traditional for Volga Bulgaria, although elements of early Renaissance and Ottoman architecture could have been used as well. In 1552, during the storming of Kazan it was destroyed by Ivan The Terrible.