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The St. Nicholas Cossack Cathedral is the oldest church in Omsk, Siberia. It was built in 1843 to Neoclassical designs by Vasily Stasov. For a long time, ministers of the cathedral have kept the banner of Yermak Timofeyevich, the Cossack Ataman who conquered Siberia. In 1929, by order of the communists, a cinema was housed in the building. It was subsequently made into a concert hall. In the early 1990s, divine services resumed in the cathedral.