a German theologian and philosopher, was born at Lubeck in 1775; became preacher in Bremen in 1805; professor of philosophy in 1807, at Landshut; and in 1826 was appointed professor at Erlangen. He died Sept. 4,1858. Koppen was an ardent follower of Jacobi (q.v.), and wrote Ueber die Offenbarung in Beziehung auf Kantsche u. Fichtesche Philosophie (Lib. 1797; 2d ed. 1802): — Schelling's Lehre odet das Ganze der Philosophie des absoluten Nichts (Hamb. 1805): — Darstellung des Wesens d. Philosophie (Nuremb. 1810):-Philosophie des Christenthums (Leipz. 1813-15, 2 vols.; 2d ed. 1825); etc.-Pierer, Universal Lexikon, 9:711.