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7. The Prince of Liechtenstein, $3.5 billion

Prince of Liechtenstein Hans Adam II attends a mass in the Cathedral of Monaco, as part of the official ceremonies
Prince of Liechtenstein Hans Adam II | Pascal Le Segretain/Getty Images

Being a prince and being able to own a private wealth firm at the same time seems like an iconic job. It certainly helped Hans-Adam II, the Prince of Liechtenstein amass quite a fortune. Along with his family, Prince Hans II owns the Liechtenstein Global Trust, which is the largest in the family-owned private wealth firm in the world.

The prince likes to spend his money on art, and his extensive art collection is on display at Liechtenstein Museum.

Next: The Prime Minister who is committed to giving his fortune away