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Prince Harry and Meghan Markle's son Archie may still be bound by a restrictive royal rule when he becomes an adult - meaning he'll have to ask permission from the monarch to marry.

While the Duke, 35, and Duchess of Sussex, 39, are raising their fourteen-month-old son in Santa Barbara, California, without a royal title, Archie remains seventh-in-line to the throne and will move up the line of succession as Prince Charles becomes King.

Under the 2013 Succession of the Crown Act rule, royals who are sixth-in-line to the throne and above must ask the presiding monarch for permission to marry, according to Iain MacMarthanne.