There is also an important condition. The title can only be inherited by the first male heir. This means Prince George is expected to receive it once William eventually becomes king.

Not the only titles they hold

The Duke and Duchess of Rothesay are far from the only titles William and Kate carry. They are also known as the Duke and Duchess of Cornwall and the Earl and Countess of Chester. Each title reflects different regions and traditions within the United Kingdom.

More changes are already on the horizon. Earlier this year, King Charles III granted them the authority to become Grantors of Royal Warrants. This means that from spring onwards, they will be able to officially endorse brands and businesses that supply goods or services to their household, a role traditionally reserved for senior royals.

In time, all of these titles will be replaced by the ultimate ones of King and Queen. Until then, their ever changing names serve as a reminder of how deeply layered and symbolic the royal system still is, even in modern Britain.