Ivan V, 1666–96, czar of Russia (1682–96), son of Czar Alexis by his first wife. Ivan was mentally retarded, and on the death of his elder brother, Feodor III , his succession was opposed by the supporters of his half-brother, Peter I (Peter the Great). However, Ivan and Peter jointly succeeded under the regency of Ivan's sister Sophia Alekseyevna . After the overthrow (1689) of Sophia's regency, Ivan was excluded from state affairs and Peter assumed control. Ivan's elder daughter, Catherine, was the grandmother of Ivan VI ; his younger daughter, Anna , became czarina of Russia in 1730.
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