Queen Elizabeth II — 1926

There are 15 Commonwealth countries in which Queen Elizabeth II reigns in addition to the United Kingdom. First-born daughter of the Duke and Duchess of York, she inherited the kingdom upon the death of her father, George VI. It was Elizabeth II who surpassed King Bhumibol Adulyadej’s reign in Thailand in 2016 as the world’s longest-reigning monarch.

In 1947, she married Prince Philip, Duke of Edinburgh, and the couple had four children. Elizabeth’s current net wealth is said to be $600 million, so healthcare and medical insurance are the least of her concerns. When it comes to British monarchs, Elizabeth II is the longest-serving.