EUPEN (Fr. Neau)  , a town of Germany, in the Prussian Rhine province, in a beautiful valley at the confluence of the Helle and Vesdre, 9 M . S. of Aix-la-Chapelle by rail . Pop . (19o5) 14,297 . It is a flourishing commercial place, and besides cloth and buckskin mills it has net and :glove manufactories, soapworks, dyeworks, tanneries and breweries, and also carries on a considerable trade in cattle and dairy produce . It has a Protestant and four Roman Catholic churches, a Franciscan monastery, a ptogymnasium, an orphanage, a hospital, and a chamber of commerce . As part of the duchy of Limburg, Eupen was under the government of Austria until the peace of Luneville in 18o1, when it passed to France . In 1814 it came into the possession of Prussia .