The Duke of Edinburgh title was created in 1726 and first held by King George II's eldest son, Prince Frederick. It was then held in 1764 by Prince William, King George III's brother.

However, Charles won't always be the Duke of Edinburgh. Rather, the title will eventually be given to his younger brother, Prince Edward. Why wasn't Prince Philip called king?

The Duke of Edinburgh title was only given to four people, the first being Prince Frederick, son of King George II, in 1726. Prince Philip held the title until his death in 2021.

EXCLUSIVE: Prince Philip’s title will eventually be passed on to his youngest son Prince Edward. The Duke of Edinburgh passed away on April 9 at age 99. "When Prince Edward got married, he wasn ...

Not only has Edward taken on a number of Philip’s duties since the duke retired in 2017, he is also a trustee as well as chairman of The Duke of Edinburgh’s International Award.

The duke’s wife, Sophie Rhys-Jones, for her part, is now the Duchess of Edinburgh. Queen Elizabeth II last held the title before ascending the throne in 1952, 70 years before her death.

The title was created in 1947 for their father, Prince Philip, who died in April 2021. One of Philip’s legacies is the Duke of Edinburgh awards, a popular youth activities program set up in 1956.

Tim Rooke/Shutterstock Edward, 57, and Sophie, 56, are close to the Queen, 95, and have been championing Philip's Duke of Edinburgh Award, with Edward serving as a trustee of the youth organization.