Yermak Timofeyevich
The Cossack ataman Yermak Timofeyevich conquered the Tyumen area, originally part of the Siberia Khanate, to the Tsardom of Russia in 1585. Both capitals of the Siberia Khanate, Sibir/Qashliq and Tyumen/Chimgi-Tura (the capital in the 15th century), were completely destroyed. Sibir was never rebuilt, though it gave its name to all concurrent and future lands in North Asia annexed by Russia, but Tyumen was later founded again. On July 29, 1586, Tsar Feodor I ordered two regional commanders, Vasily Borisov-Sukin and Ivan Myasnoy, to construct a fortress on the site of the former Siberian Tatar town of Chingi-Tura ("city of Chingis"), also known as "Tyumen", from the Turkish and Mongol word for "ten thousand" – "tumen".