When Archie Harrison Mountbatten-Windsor was born, his parents Prince Harry and Meghan Markle opted to not give him a royal title.
Their reasoning behind this was to try and provide him with the most 'normal' life possible.
But it has been revealed that even though Archie will grow up without a HRH title, he may be still bound by a rather restrictive royal rule.
When Archie's grandfather, Prince Charles, takes the throne, Archie will become sixth in line for the British throne, which will force him to ask the monarch for permission to marry, according to the 2013 Succession of the Crown Act.
The only way Archie has a chance at doging the rule, which applys for anyone who is sixth-in-line to the throne or above, is if the Duke & Duchess of Cambridge have another baby.
Archie will reportedly also become a prince automatically when Charles takes the throne and will have the option to decline the title again when he turns 18.
At the moment Archie is seventh in line for the throne, behind his father who is currently sixth in line for the throne.
But, when Prince Charles takes over, these rules will be in place.