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Prince of Liège (French: Prince de Liège, Dutch: Prins van Luik, German: Prinz von Lüttich) is a substantive title awarded by King Albert I of the Belgians to his youngest grandson, Prince Albert (the future King Albert II), while he was third in line to the throne of Belgium on 7 June, 1934. The title was used from that date until his accession as King of the Belgians on 9 August 1993. His wife, the former Queen Paola, was known as the Princess of Liège from their marriage in 1959 until their accession in 1993.
Albert's elder brother Prince Baudouin (the future King Baudouin) was known as the Count of Hainaut while his father, Prince Leopold (later King Leopold III), was the Duke of Brabant at the time of Albert's birth. Leopold's brother held the title of Count of Flanders. This meant that all the commonly used titles in the Belgian Royal Household had been given, so a new style had to be created.
King Albert II decided in 2001 to no longer award courtesy titles such as Count of Flanders, Count of Hainaut, and Prince of Liège. The heir to the throne is awarded the title Duke or Duchess of Brabant. It is currently held by Princess Elisabeth, Duchess of Brabant. It is therefore likely that Albert II will be the only Prince of Liège.