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https://euzicasa.wordpress.com/2014/01/27/this-day-in-the-yesteryear-the-walk-to-canossa-pope-lifts-holy-roman-emperors-excommunication-1077/
THIS DAY IN THE YESTERYEAR: THE WALK TO CANOSSA: POPE LIFTS HOLY ROMAN EMPEROR'S EXCOMMUNICATION (1077)