9) Albert II, Prince of Monaco – $1 billion

Albert II is one of the richest royals in the world. He owns real estate in France and Monaco. His real estate includes holdings in the Société des bains de mer de Monaco, which operates Monaco’s casino and other entertainment properties in the principality. He is not only the reigning monarch of the Principality of Monaco, but also the head of the Princely House of Grimaldi.