The Principality of Opava or Duchy of Troppau was a historic territory split off from the Margraviate of Moravia before 1269 by King Ottokar II of Bohemia to provide for his natural son, Nicholas I. The Opava territory thus had not been part of the original Polish Duchy of Silesia in 1138, and was first ruled by an illegitimate offshoot of the Bohemian Přemyslid dynasty, not by the Silesian Piasts like many of the neighbouring Silesian duchies. Its capital was Opava (Troppau) in the modern-day Czech Republic.

Hans-Adam II is the Prince of Liechtenstein. He is the son of Prince Franz Joseph II and his wife, Countess Georgina von Wilczek. He also bears the titles Duke of Troppau and Jägerndorf, and Count of Rietberg. Under his reign, a 2003 constitutional referendum expanded the powers of the Prince of Liechtenstein. In 2004, Hans-Adam transferred day-to-day governmental duties to his eldest son Hereditary Prince Alois as regent, like his father had granted him in 1984 to prepare him for the role.