King Bhumibol Adulyadej

1946–2016 / Thailand

In 2012, the Guinness World Record holder for the richest royal was King Bhumibol Adulyadej, King Rama IX of the Chakri dynasty of Thailand. According to Forbes, his wealth amounted to £22 billion ($30 billion), and his riches included the largest cut diamond in the world, a 545-carat jewel known as the Golden Jubilee Diamond.

King Bhumibol Adulyadej passed away in 2016, but no royal yet comes close to taking his title. The nearest is Hassanal Bolkiah, the Sultan of Brunei, who was reportedly worth £15 billion ($20 billion) in 2011.

“According to Forbes, king Bhumibols Adulyadej’s wealth amounted to £22 billion”