Feodor I (Feodor Ivanovich)fyô´dər, ēvä´nəvĭch [key], 1557–98, czar of Russia (1584–98), son of Ivan IV (Ivan the Terrible). Weak and incompetent, he left the government in the hands of his brother-in-law, Boris Godunov, who became czar after Feodor's death.
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