
We know that the Prince and Princess of Wales’ eldest child, Prince George, will one day be king. But as for Princess Charlotte? Well, we’re not totally sure, though it could eventually be the Duchess of Edinburgh (currently held by Sophie, the wife of Prince Edward, Duke of Edinburgh) or Princess Royal, a title currently carried by Princess Anne, the only sister of King Charles.
The prestigious Princess Royal title is generally held by the eldest daughter of a monarch—Anne is Queen Elizabeth and Prince Philip’s only daughter, so that checks out here. There have only been seven Princesses Royal to date, the first being Princess Mary, the eldest daughter of King Charles I and Queen Henrietta Maria, The Sun reports.