Prince Hans-Adam II and Princess Marie of Liechtenstein
The Prince of Liechtenstein was born on Valentine’s Day in 1945 and has reigned over the tiny but wealthy Alpine country since 1989.
Europe’s richest royal has a family-owned bank, extensive investments, several palaces, swathes of land and a 400-year-old art collection.
His net worth was estimated to be $3.5 billion in 2011, according to the latest royal rich list from Forbes.
Prince Hans-Adam II’s family own the Liechtenstein Global Trust (LGT) – the largest family-owned private wealth firm in Europe.
Hans-Adam II and his wife Marie in Vaduz, Liechtenstein, in July 1967
The royal’s impressive art collection – including works by Rembrandt and Rubens – is on display in the Liechtenstein Museum in Vienna.
The wealth of the little-known royal family in Liechtenstein eclipses the personal wealth of the British Queen Elizabeth II.
Forbes has pegged the Queen’s personal net worth at just a half a billion because it does not count the monarchy’s assets such as Buckingham Palace.
Hans-Adam has four children with his wife, Princess Marie, as well as 14 grandchildren.
Born in Zürich, Switzerland, he is the eldest son of Prince Franz Joseph II and Princess Gina of Liechtenstein.
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The prince used to say he worked as a "businessman in the morning to pay to be prince in the afternoon”, according to the Telegraph.
Hans-Adam remains head of state but passed the day-to-day running of Liechtenstein to his son, Crown Prince Alois, in 2004.
The royals won new powers – including the power to veto parliamentary decisions and sack the Government – in a constitutional referendum in 2003.
The Prince of Liechtenstein stressed the importance of the nation-state in the modern world in his political treatise The State in the Third Millennium.