John Emerich Edward Dalberg-Acton, 1st Baron Acton, KCVO DL (10 January 1834 - 19 June 1902), was an English Catholic historian, politician and writer. He was the only son of Sir Ferdinand Dalberg-Acton, 7th Baronet and a grandson of the Neapolitan admiral Sir John Acton, 6th Baronet. From 1837 to 1869 he was known as Sir John Dalberg-Acton, 8th Baronet.
He is perhaps best known for the remark in a letter to an Anglican bishop, "Power tends to corrupt, and absolute power corrupts absolutely. Great men are almost always bad men,..."
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