Founder of Socialism in Germany, born at Breslau, of Jewish parents; attended the universities of Breslau and Berlin; became a disciple of Hegel; took part in the Revolution of 1848, and was sent to prison for six months; in 1861 his "System of Acquired Rights" started an agitation of labour against capital, and he was again thrown into prison; on his release founded an association to secure universal suffrage and other reforms; returning to Switzerland he conceived a passionate affection for a lady betrothed to a noble whom she was compelled to marry, and whom he challenged, but by whom he was mortally wounded in a duel (1825-1864).