Henry Addington, 1st Viscount Sidmouth

Henry Addington, 1st Viscount Sidmouth, PC was a British statesman who served as Prime Minister from 1801 to 1804. He is best known for obtaining the Treaty of Amiens in 1802, an unfavourable peace with Napoleonic France which marked the end of the Second Coalition during the French Revolutionary Wars. When that treaty broke down he resumed the war but he was without allies and conducted a relatively weak defensive war, ahead of what would become the War of the Third Coalition. He was forced from office in favour of William Pitt the Younger, who had preceded Addington as Prime Minister. Addington is also known for his ruthless and efficient crackdown on dissent during a tenyear spell as Home Secretary from 1812 to 1822. He was the longest continuously serving holder of that office since it was created in 1782.

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Source: Wikipedia