Answer
The answer is Russian. Yermak Timofeyevich, also known as Yermak the Conqueror, was a Russian Cossack ataman and explorer of Siberia. He led the conquest of the Khanate of Sibir in the late 16th century, bringing much of Western Siberia under the control of the Tsardom of Russia. Yermak is widely considered a Russian folk hero and is celebrated for his bravery, leadership, and role in expanding the Russian Empire.