Campaigner for the abolition of the slave trade, and a friend of the Wordsworths, Coleridge and Southey. He moved to the Lake District in 1794 and lived in retirement at Eusemere, near Pooley Bridge, Ullswater, until 1806. Clarkson and his wife returned to her native Suffolk in 1806, and remained there until his death. He returned to the campaign against the slave trade in 1804 and wrote ceaselessly in the cause until the passing of the 1833 Act abolishing slavery in the British empire. He also wrote admiringly of the Quakers.