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3. Brunei’s Sultan, $20 billion

Brunei's Sultan Hassanal Bolkiah attends the opening session of the 31th Association of Southeast Asian Nations (ASEAN)
Brunei’s Sultan Hassanal Bolkiah | Athit Perawongmetha/AFP/Getty Images

Hassanal Bolkiah, the Sultan of Brunei, had an estimated wealth of $20 billion back in 2011, and if we could guess we’d say it has only grown from there. Sultan Bolkiah made his fortune as a result of oil and gas development in his country. The word is, the 71-year old knows how to spend his dough well. He apparently owns more than 600 Rolls-Royces — because those cars are essential to life apparently.

His palace which is named Istana Nurul Iman is the largest in the world and is worth an enormous, $350 million.

Next: The late king who has shares in several different banks