The United Kingdom of the Netherlands is the unofficial name given to the Kingdom of the Netherlands as it existed between 1815 and 1830. The United Netherlands was created in the aftermath of the Napoleonic Wars through the fusion of territories that had belonged to the former Dutch Republic, Austrian Netherlands, and Prince-Bishopric of Liège in order to form a buffer state between the major European powers. The polity was a constitutional monarchy, ruled by William I of the House of Orange-Nassau.

The Prince-Bishopric of Liège or Principality of Liège was an ecclesiastical principality of the Holy Roman Empire that was situated for the most part in present-day Belgium. It was an Imperial Estate, so the bishop of Liège, as its prince, had a seat and a vote in the Imperial Diet. The Prince-Bishopric of Liège should not be confused with the Diocese of Liège, which was larger and over which the prince-bishop exercised only the usual responsibilities of a bishop.