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11. The Sultan of Oman, $700 million

 The Sultan of Oman
The Sultan of Oman | Chris Jackson/Getty Images

Qaboos bin Said al Said is the Sultan of Oman, who has built his fortune from Oman’s immense gas and oil resources.

He’s used an extensive amount of his $700 million net worth to personally restore mosques around the world. It’s a pretty cool way to spend money if you ask us.

Next: A prince known for his global charity work