a small market-town of Prussia, government of Coblenz, circle of Adenau, with 300 inhabitants. It is situated on the river Aar, and has a castle, the ancient residence of the dukes of Arenberg, who thence derived their title. About the year 1298, the earldom of Arenberg came by marriage to John of Engelbert, earl of Mark, in whose family it continued till 1547, when John of Barbançon, of the celebrated house of Ligne, by marrying the only daughter of the last earl, obtained possession of the lands. In 1572 it was raised to a principality, and ranked among the German States. In 1582, the prince obtained a seat in the diet; and Prince Philip Charles, who died in 1616, by marrying Ann of Croy obtained the possessions of the duke of Croy and Arschot. In 1644 Philip Francis, then the reigning prince, received the title of duke. By the peace of Lunéville concluded in February 1801, between Austria, in the name of the German empire, and France, by which Belgium and the territory on the left bank of the Rhine were ceded to France, the duke lost the greater part of his possessions, and received as compensation the territories of Recklinghausen and Moppjen. On the establishment of the confederation of the Rhine, the duke became a member of that body; but in 1810 he lost his sovereignty by Napoleon's incorporating his dukedom with France and the grand duchy of Berg, for which he received a rent of 240,702 francs, and remained in possession of his domains. In 1815 the duke received back his possessions, which, at the Congress of Vienna, were mediatised, a part to Prussia, and a part to Hanover. On account of the former, he became a peer of the Westphalian Estates; and, by the latter, a member of the House of Lords in Hanover. George IV., on 9th May 1826, elevated the duke's possessions in Hanover to a dukedom, under the title of Arenberg-Meppen. The present duke is also a grandee of Spain of the first class. His German possessions extend over about 780 geographical square miles, with 94,000 inhabitants; of which, 544 square miles, with 50,000 inhabitants, are in Hanover; besides which he has large estates in France, and extensive tracts of forest in the Pyrenees. The present duke resides at Brussels; and his income from all his estates is about 750,000 guilders, or £62,500.