Prior to its change of stating the children as ‘Prince Archie of Sussex’ and ‘Princess Lilibet of Sussex’, they were known by ‘Master’ and ‘Miss’.

In the second statement, released by the couple, they added it is a “birthright” for the two children to hold the titles as soon as their grandfather became monarch. referring to a 1917 royal protocol.

In the royal protocol, which dates back to 1917, King George V issued a letter patent meaning the grandchildren of the monarch have the right to HRH titles, but not great-grandchildren.

On Wednesday, a spokesperson for the Duke and Duchess of Sussex revealed the couple’s 21-month-old daughter had been christened in the US last week.

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