In German Koln, capital of Rhenish Prussia, and a fortress of first rank, on the left bank of the Rhine, 175 m. SE. of Rotterdam; is a busy commercial city, and is engaged in eau-de-Cologne, sugar, tobacco, and other manufactures. It has some fine old buildings, and a picture gallery; but its glory is its great cathedral, founded in the 9th century, burnt in 1248, since which time the rebuilding was carried on at intervals, and only completed in 1880; it is one of the masterpieces of Gothic architecture.