Augustus Frederick, Duke of Sussex was the sixth son of George III. He was mild man who suffered from asthma. He met Lady Augusta Murray while travelling in Italy and the two marry without consent from the king. A year later, the marriage was deemed illegal under the Royal Marriages Act 1772 and annulled in the Prerogative Court but the two continued living together for nearly decade despite it. They had two children whom she retained custody of when they seperated. A year after Augusta's death he married in accordance to Royal Marriages Act, to Lady Cecilia Letitia Buggin. They had no children and he died without a legitimate heir.
Sussex was firm in his liberal opinions, he was a scientist, patron of the arts and collector of books. He was also Queen Victoria's favourite uncle and the one who gave her away at her wedding to Prince Albert.