Augustus Frederick Duke of Sussex
- Category : Notable-Famous-Royal-family
- Type : PE
- Profile : 1/3 - Investigating / Martyr
- Definition : Split - Large
- Incarnation Cross : RAX The Four Ways 4
- Birth Year: 1773
- Birthday: 27. January
- Birthplace: London, United Kingdom
- Category: Notable-Famous-Royal-family
- Profile: 1-3
- Type: Emotional Projector
- Inc.Cross: The Four Ways 4
- Definition: Double Split - Large
- Variables: BLL-MRL
- 4764 Abstraction
- 1949 Synthesis
- 3740 Community
- 2838 Struggle
- 2551 Initiation
- 2461 Awareness
British royalty, the sixth son of George III of the United Kingdom and his consort, Charlotte of Mecklenburg-Strelitz. He was the only surviving son of George III who did not pursue an army or naval career.
In Rome on 4 April 1793 he secretly married Lady Augusta Murray (1768–1830). The couple married again without revealing their full identities at St. George's, Hanover Square, London, on 5 December 1793. Both marriages took place without the knowledge or the consent of the King. In August 1794, the Prerogative Court annulled the marriage on the grounds that it contravened the Royal Marriages Act 1772 because it had not been approved by the King. They had two children named Augustus Frederick D'Este and Ellen Augusta Emma, Mademoiselle D'Este. The Duke of Sussex married a second time on 2 May 1831 (again in contravention of the Royal Marriages Act) to Lady Cecilia Letitia Buggin (1793–1873).
The King had created him Duke of Sussex, Earl of Inverness, and Baron Arklow in the peerage of the United Kingdom and a Knight of the Garter on 27 November 1801. When he died on 21 April 1843 without legitimate issue, the title became extinct.