8.25 square miles (21.4 km 2 ) with 25,000 inhabitants around the capital  St. Wendel . In 1819 this land received the name of Principality of  Lichtenberg . He sold it to  Prussia  in 1834. In  Gotha  on 3 July 1817 Ernest married Princess  Louise of Saxe-Gotha-Altenburg . They had two children: