Katzenelnbogen is the name of a castle and small city in the district of Rhein-Lahn-Kreis in Rhineland-Palatinate, Germany. Katzenelnbogen is the seat of the Verbandsgemeinde („collective municipality“) Katzenelnbogen.
Katzenelnbogen originated as a castle built on a promontory over the river Lahn around 1095. The lords of the castle became important local magnates, acquiring during the centuries some key and highly lucrative customs rights on the Rhine. The Counts of Katzenelnbogen also built Burg Neukatzenelnbogen and Burg Rheinfels on the Rhine. The German family died out in 1479, while the Austrian lineage continued, and the county became disputed between Hesse and Nassau. In 1557, the former finally won, but when Hesse was split due to the testament of Philipp the Magnanimous, Katzenelnbogen was split as well, between Hesse-Darmstadt and the small new secondary principality of Hesse-Rheinfels. When the latter line expired in 1583, its property went to Hesse-Kassel (or Hesse…