Why Princess Beatrice's Daughter Has a Title — but Sister Princess Eugenie's Son Does Not

Princess Eugenie's son does not have a royal title, but her older sister Princess Beatrice's daughter had one ... from Italy.

Buckingham Palace announced on Sept. 20, 2021, that Princess Beatrice welcomed her first child, Sienna Elizabeth, with husband Edoardo Mapelli Mozzi two days before. Although the baby girl's name wasn't formally announced until later, it was known when she was born that her name would include a royal title — but not because Beatrice is the granddaughter of Queen Elizabeth!

Edoardo descends from Italian aristocracy — which means that Princess Beatrice became an Italian "Contessa" and "Nobile Donna," or noblewoman, after their July 2020 wedding.

The oldest son of Count Alessandro Mapelli Mozzi, Edoardo will inherit his family's ancestral seat, the 18th-century Villa Mapelli Mozzi palace in northern Italy.

"Edoardo is the only male descendent taking the family into the next generation," Edoardo's father told Daily Mail in 2020. "He is a count — his wife will be a countess automatically, and any of their children will be counts or nobile donna."

Traditionally, royals are granted titles on their wedding days by the monarch. The Queen handed her grandson, Prince Harry, a dukedom on his wedding day to Meghan Markle in May 2018, officially making them the Duke and Duchess of Sussex. Similarly, Prince William and Kate Middleton were named the Duke and Duchess of Cambridge upon their 2011 wedding, though they were later given the additional titles of Prince and Princess of Wales by King Charles the day after the late monarch's death in September 2022 (the titles became official in February 2023).

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While Beatrice and her sister Eugenie kept their royal status, they did not receive titles from the Queen. Therefore, Princess Eugenie's son, August Philip Hawke Brooksbank, did not inherit any titles from his parents when he was born in February 2021.

Beatrice's name was previously styled as "Her Royal Highness Princess Beatrice of York." Now that she's married, her title will drop York — a reference to her parents, Prince Andrew and Sarah Ferguson, the Duke and Duchess of York. Her name is styled now as "Her Royal Highness Princess Beatrice, Mrs. Edoardo Mapelli Mozzi."

Princess Eugenie underwent a similar change after her October 2018 wedding to Jack Brooksbank. The Court Circular has referred to the royal as "Princess Eugenie, Mrs. Jack Brooksbank."

In 2016, Prince Andrew refuted reports that he had demanded titles for "any future husbands" of daughters Eugenie and Beatrice. At the time, Andrew said he simply wanted his children to be considered "modern, working young women who happen to be members of the royal family."

Days after Princess Beatrice delivered her daughter, Buckingham Palace released a statement announcing the exciting news. "Her Royal Highness Princess Beatrice and Mr Edoardo Mapelli Mozzi are delighted to announce the safe arrival of their daughter on Saturday, 18th September 2021, at 23.42, at the Chelsea and Westminster Hospital, London."

Noting that the newborn weighed "6 pounds and 2 ounces," the statement continued, "The new baby's grandparents and great-grandparents have all been informed and are delighted with the news. The family would like to thank all the staff at the hospital for their wonderful care."

The statement continued: "Her Royal Highness and her child are both doing well, and the couple are looking forward to introducing their daughter to her big brother Christopher Woolf."

Beatrice also shared the news on Twitter (now X).

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Princess Beatrice was already a stepmother to Edoardo's son Wolfie. Edoardo shares joint custody of his son with his ex-partner, Dara Huang, an American architect and designer who splits her time between London and Hong Kong.

"Edo is easily one of the best dads; he is so involved, and Beatrice is already showing that she's a fantastic step-mummy," a source previously told PEOPLE. "They've been on family vacations together [with his son]. They are really happy."

Another insider previously told PEOPLE that Princess Beatrice has "embraced [Wolfie] as part of her life from the outset."