Harry, 33, becomes His Royal Highness The Duke of Sussex.

His bride, Markle, 36, becomes Her Royal Highness The Duchess of Sussex.

The title is considered a gift from Queen Elizabeth, Harry's grandmother.

\"PHOTO:
Victoria Jones/AFP/Getty Images
PHOTO: Britain's Prince Harry with his fiancee Meghan Markle arrive to attend a memorial service at St Martin-in-the-Fields in Trafalgar Square in London, on April 23, 2018, to commemorate the 25th anniversary of the murder of Stephen Lawrence.
>

When Harry's older brother, Prince William, the second in line to the throne, married Kate Middleton in 2011, the couple became the Duke and Duchess of Cambridge.

\"PHOTO:
Mark Cuthbert/UK Press via Getty Images, FILE
PHOTO: Kate Middleton, the Duchess of Cambridge and Prince William at Buckingham Palace following their wedding at Westminster Abbey on April 29, 2011, in London.
>

On their children's birth certificates, William identified his occupation and Kate's as the Prince of the United Kingdom and the Princess of the United Kingdom, respectively, so Kate is also called Princess Kate.

If Prince Charles, William and Harry's father, becomes king, William will then become the Prince of Wales and Kate, the Princess William of Wales.

Harry, sixth in line to the throne, is more likely to keep his dukedom, leaving Markle as a duchess in Britain's royal family.

\"PHOTO:
Chris Jackson/Getty Images
PHOTO: Meghan Markle and Prince Harry speaks they attend the Women's Empowerment reception at the Royal Aeronautical Society, April 19, 2018, in London.
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