Frederick-William Iv.
From BiblePortal Wikipedia
Frederick-William Iv. [1]
King of Prussia from 1840 till 1861; his reign is marked by the persistent demands of the people for a constitutional form of government, which was finally granted in 1850; a year previous he had declined the imperial crown offered by the Frankfort Diet; in 1857 he became insane, and his brother was appointed regent (1795-1861).
