The 3rd Viscount Sidmouth, born on December 24, 1791, was a British nobleman named Henry Addington. He succeeded his father, the 2nd Viscount Sidmouth, in 1844. The title of Viscount Sidmouth was created in 1805, and the family has a long history in British politics. Henry Addington served as a member of the House of Lords and was known for his involvement in various social and political issues of his time. He passed away on March 24, 1864, and the title was inherited by his son, continuing the family's legacy in the British aristocracy.