OBERLAHNSTEIN  , a

town of Germany, in the Prussian province of Hesse-Nassau, on the right bank of the Rhine, at the confluence of the Lahn 4 M. above Coblenz, on the railway from Cologne to Frankfort-on-Main . Pop . (1905) 8472 . It still retains parts of its ancient walls and towers, and possesses a castle, the Schloss Martinsburg, formerly the residence of the electors of Mainz, and the chapel, Marien Kapelle, in which the German king Wenceslaus was deposed by the electors in 1400 . Near the town is the castle of Lahneck, built about 1290, destroyed by the French in 1689, and restored in 1854 . In the neighbourhood are lead and silver mines . See J . Wegeler, Lahneck and Oberlahnstein (Trier, 1881) .