When it comes to the easiest ways to get rich, being born into a royal family must come pretty close to the top.
These fabulously wealthy individuals have huge inherited riches, often thanks to the country they rule having deposits of oil and other valuable natural resources.
Then there’s the ownership of palaces, castles, jewels and art collections.
Here are the 10 wealthiest, according to Celebrity Networth.
5. Hans Adam II
The Prince of Liechtenstein, Hans Adam II, has ruled over the tiny European country since 1989. His money comes from banking - he turned the small local family bank LGT into an international financial group. He's worth around $7 billion. | Getty Images
6. King Mohammed VI of Morocco
The ruler of Morocco, King Mohammed VI, is the world's sixth richest royal. His fortune of around $6 billion makes him the wealthiest king in Africa. He has a huge number of business holdings across several economic sectors, including banking, mining and insurance. | Getty Images
7. Princess Marie-Chantal
Greek royal Princess Marie-Chantal is English by birth and is the wealthiest female royal in the world. She is married to Pavlos, Crown Prince of Greece, who would have become King of Greece had the monarchy not been abolished abolished in 1973. She still holds the title, as well as being Princess of Denmark. Her father is billionaire businessman Robert Warren Miller who co-founded Duty Free Shops. She has a net worth of $2 billion. | Getty Images
8. Albert II
Albert II, Prince of Monaco Albert II, has reigned in the principality since 2005 and is worth around $1 billion. His wealth comes from owning large amounts of land in Monaco and France, and interests in the entertainment industry, including Monaco's famous casinos. | Getty Images