The Russian ruler who first took the title of tsar, who expanded the territories of Russia to the east, and who crushed the power of the nobility was

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Ivan IV, also known as Ivan the Terrible, was the first Russian ruler to take the title of tsar which meant "Caesar" or "emperor". He expanded the territories of Russia to the east, conquering the lands of the Khanate of Kazan and Astrakhan, and crushed the power of the nobility through the implementation of the oprichnina, a political system of terror and persecution of the boyars (nobility).

The Russian Ruler Who First Took the Title of Tsar