İske Qazan (literally: Old Kazan; Cyrillic: Иске Казан), was a Bolghar-Tatar city in the 13-16th centuries, situated on the banks of the Qazansu river in the Qazan artı or Zakazanye region, in what is today the Russian Federation republic of Tatarstan . In 18th century Tatar literature, İske Qazan was said to have been founded by the brothers Altınbäk and Ğälimbäk during Mongol invasion of Volga Bulgaria. Today the Urıs Urmatı and Qamay ruins are the ruins of İske Qazan.