sentences:  After French rule ended, the Congress of Vienna established the Principality of Lichtenberg in 1816, which was awarded as a newly created exclave to the Duchy of Saxe-Coburg-Saalfeld, which as of 1826 became the Duchy of Saxe-Coburg and Gotha.In 1834, the duchy sold this principality to the Kingdom of Prussia.Within Prussia's Rhine Province, it formed the district of Sankt Wendel, which was in turn divided into several "Ämter".