John Dalberg-Acton, 1st Baron Acton
John Emerich Edward Dalberg-Acton, 1st Baron Acton, 13th Marquess of Groppoli,  (10 January 1834 – 19 June 1902), better known as Lord Acton, was an English Catholic historian, politician, and writer. A strong advocate for individual liberty, Acton is best known for his timeless observation on the dangers of concentrated authority. In an 1887 letter to an Anglican bishop, he famously wrote, "Power tends to corrupt, and absolute power corrupts absolutely," underscoring his belief that unchecked power poses the greatest threat to human freedom. His works consistently emphasized the importance of limiting governmental and institutional power in favor of individual rights and personal liberty.