A German Socialist, born at Trèves, of Jewish descent; was at first a student of philosophy and a disciple of Hegel, but soon abandoned philosophy for social economy on a democratic basis and in a materialistic interest, early adopted socialistic opinions, for his zeal in which he was driven from Germany, France, and finally Belgium, to settle in London, where he spent the last 30 years of his life; founded the "International", and wrote a work "Das Kapital," which has become the text-book of Socialism, a remarkable book, and one that has materially promoted the cause it advocates (1818-1866).