Bonn (anc. Bonna), a town of Rhenish Prussia, beautifully situated on the left bank of the Rhine (here 600 yards wide), 21 miles SSE. of Cologne by rail. The Minster, said to have been founded by the Empress Helena in 320, but dating chiefly from the 11th and 13th centuries, has five towers, the middle one 311 feet high. Near it is a monument to Beethoven, who was born in the Rheingasse; and at Bonn are buried Niebuhr, Bunsen, and Schumann. The university, founded in 1777-86, in 1802 was transformed into a lyceum, but was re-established in 1818, receiving from government the beautiful electoral palace (1717-30) and other buildings, with an annual revenue of nearly £15,000 sterling. It has 126 professors and lecturers, and over 1200 students. Among its professors have been Niebuhr, A. W. Schlegel, Arndt, Welcker, Dahlmann, Hermes, and Simrock; Prince Albert was a student here. It has a library of above 250,000 volumes, a splendid laboratory (1868), an art museum (1884), a botanic garden, etc. The manufactures - jute, soap, chemicals, etc. - are unimportant. Pop. (1871) 26,030; (1890) 38,805; (1900) 50,737, chiefly Catholic Bonny, or Boni, a town and a river of Guinea, now in the British Niger protectorate. The river forms an eastern debouchure of the Niger, and falls into the Bight of Biafra. On the east side, near its mouth, is the town of Bonny, notorious from the 16th to the 19th century as the rendezvous of slave-trading ships.