Prince Augustus Frederick , Duke of Sussex ( 27 January 1773 -- 21 April 1843 ) , was the sixth son of George III of the United Kingdom and his consort , Charlotte of Mecklenburg-Strelitz .
Prince Augustus Frederick , Duke of Sussex was born ( 27 January 1773 -- 21 April 1843 ) , was the sixth son of George III and his consort , Queen Charlotte .