Princess Eugenie's daughter Adelaide holds no royal title under the 1917 Letters Patent

Princess Eugenie and Jack Brooksbank confirmed their daughter's name as Adelaide Elizabeth Annina Brooksbank on 17 August 2026, two weeks after her birth in Lisbon on 3 August. Adelaide holds no HRH or Princess style: under the 1917 Letters Patent — the formal instrument setting who may use those titles — they pass through the male line to a sovereign's grandchildren, not to great-grandchildren.