The importance of status is vividly illustrated by perhaps the most celebrated summit in German history: the meeting at Canossa in 1077 between Pope Gregory VII and Holy Roman Emperor Henry IV. In German this is known as der Canossagang, the journey to Canossa; more aptly in Italian as l’umiliazione di Canossa, for it was truly a humiliation. In the Investiture Controversy—the power struggle between pope and emperor over the right to appoint bishops—Henry had renounced Gregory as pope, only to find himself excommunicated. This papal edict not only imperilled Henry’s immortal soul, it also laid him open to revolt by the Germannobility. He sought a meeting with Gregory who, fearing violence, retreated to the castle of Canossa, in safe territory south of Parma. This forced the emperor to come to him. What exactly happened is shrouded in legend, but supposedly Henry arrived in the depths of winter, barefoot and in a pilgrim’s hair shirt, only to be kept waiting by Gregory for three days. When he was finally admitted to the castle on January 28, 1077, the emperor knelt before the pope and begged forgiveness. He was absolved and the two most powerful figures in Christendom then shared the Mass.
David Reynolds, Summits: Six Meetings that Changed the Twentieth Century (2007), p. 14
The reconciliation was short-lived. After being excommunicated a second time Henry crossed the Alps with his army and replaced Gregory with an “antipope” of his own. But the events themselves matter less than the myth that grew up around them. During the German Reformation Henry was lionized as the defender of national rights and the scourge of the Catholic pope, often being dubbed “the first Protestant.” And during Chancellor Otto von Bismarck’s struggle to rein in the Catholic church, he famously declared in the Reichstag on May 14, 1872: “We will not go to Canossa, neither in body nor in spirit.” He was voicing the new German Reich’s resolve to accept no outside interference in its affairs—political or religious. As a result Henry IV shivering outside the gates of Canossa became a familiar figure in late-nineteenth-century German art; the phrase “to go to Canossa” (nach Canossa gehen) entered the language as a synonym for craven surrender— almost the equivalent of “Munich” to the British and Americans.
David Reynolds, Summits: Six Meetings that Changed the Twentieth Century (2007), pp. 14-15