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In page Catherine Ivanovna of Russia:

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On the death of Peter II in 1730, the Supreme Privy Council considered Catherine as a candidate for the tsardom as the eldest daughter of Ivan V, but the fear that her spouse would gain influence in Russia and her own independent and capricious nature led to her widowed younger sister Anna, Duchess of Courland, being chosen instead, because she was considered more docile.[citation needed]