British royal titles can be a bit confusing, even for those who follow the family regularly.

He kept both titles until his death in 2021.

Queen Elizabeth gave her when she married William, who was given the title the Duke of Cambridge himself.

Princess Diana smiling

So, why would one woman who married a British prince be called a princess but another is not?

Instead, it was the public that bestowed the title “Princess Diana” upon her and it stuck.

Even Kate’s official royal name is not just the Duchess of Cambridge.

Kate Middleton smiling

Now, that’s a mouthful and likely why she is colloquially just known as “Kate.”