Baron John Emerich Edward Dalberg Acton Acton

Raised in a cosmopolitan Catholic family, Lord Acton was born in Naples in 1834 and educated largely in Europe, including under the historian Ignaz von Döllinger in Munich. He became known as a scholar, essayist, and public figure whose work joined history, politics, and religion in a serious defense of liberty.

Acton served as a Liberal member of Parliament and later held the title of Regius Professor of Modern History at Cambridge. He never completed the large historical works he imagined, but his essays, lectures, and letters gave him a lasting reputation for intellectual range and moral intensity.

He is remembered above all for his insistence that power must be judged ethically, not excused by status or success. That conviction shaped both his historical writing and the line most often linked to him: the warning that power tends to corrupt, and absolute power corrupts absolutely.