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Ivan father dies and he is left as Grand Prince of Moscow at the age of 3 but does not actually get to rule because of his young age. Giving him not much influence of his father to rule Russia
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Ivan IV turns 16 and is crowned as the first Tsar of Russia. Since he was so young his early good years were mostly influenced by boyars that helped him out and took a big part in his decision making.
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His first wife Anastasia Romanovna died and this became a big impact on Ivan. It is when he lost the trust of his boyars and is influenced by the belief that the boyars are traitors and he should have all the power. Her death had left him in depression and delusional.
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Ivan IV established his own secret police as an absolute ruler who killed many boyars and their families. Influenced him to become more powerful and want power even more and more. Which meant he wanted to acquire more land from others.
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Ivan the Terrible kills his eldest son whom was heir to the throne. The influence left a big impact on his country making it so that Russia's next ruler would be his weaker son whom was not ready.