Frederick William IV
noun
1795–1861, king of Prussia 1840–61 (brother of William I of Prussia).
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British Dictionary definitions for frederick william iv
Frederick William IV
noun
1795–1861, king of Prussia (1840–61). He submitted to the 1848 Revolution but refused the imperial crown offered by the Frankfurt Parliament (1849). In 1857 he became insane and his brother, William I, became regent (1858–61)
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