Divided Charlemagne's empire into three separate kingdoms
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the hundred years' of war
1075-Lay investiture banned; 1077-Henry IV's journey to Canossa; 1122-The Concordat at Worms compromise on lay investiture; 1176-Battle of Legnano. All were power struggles because the duties and privileges of Church and state were changing during this time.
The lay investure or the practice whereby political rulers appointed many high church officials, such as bishops.
1122 was the 12th century.
It brought an end to the Investiture Controversy and recognized the right of the Church to appoint its own bishops. It was an important step toward the idea of separation of Church and State, and was an blow to the belief in the divine right of kings.