4) Prince Aga Khan IV – Net Worth: $800 Million

Prince Aga Khan IV is a British business tycoon. He is the 49th and current Imam of Nizari Ismailism a denomination of Ismailism within Shia Islam consisting of an estimated 5 to 15 million ardents.

3) Prince Albert II – Net Worth: $1 Billion

This 55 year old ruler of Monaco owns vast amounts of land in both Monaco and France. He created the Prince Albert II of Monaco Foundation in 2006. It supports sustainable and ethical projects around the world.