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The Carolingian Empire was a large empire that existed during the middle ages. It consisted of almost all of the territory of the former Roman Empire. The Carolingian Empire ended with the death of Charles III.
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Otto I, also known as Otto The Great, became the Emperor of the Holy Roman Empire on February 2, 962. He was official the first Emperor of the Holy Roman Empire.
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Pope Gregory was most well known for his reforms of Roman Catholicism. It was during his time as well that the Roman Catholic Church and the Byzantine Empire began to have poor relations.
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Pope Urban calls for a 'just war' at the Council of Clermont in 1095. This began the First Crusade which aimed at aiding the Byzantine Empire along with a secondary goal to capture Jerusalem. Capturing Jerusalem eventually became the primary objective.
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The First Lateran Council was summoned by Pope Callixtus II in December 1122. Its main goal among many was to free the Church from secular influence and reduce the Emperor's influence in papal elections.
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The Second Crusade was called upon by Pope Eugene III as a result of the fall of the crusader state known as the County of Edessa in 1144. The result of this crusade was a decisive victory for Islamic forces.
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The Fourth Crusade was summoned by Pope innocent III in 1202. The original goal was to reconquer Jerusalem and free it from Muslim control. However, this quickly changed into an attack on the Byzantine Empire instead. The result was the establishment of the Latin Empire.
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The Fourth Lateran Council was called upon by Pope Innocent III. The results of this council were: the pronouncement of marriage banns, the declaration of Christians to confess their sins at least once a year, and the teaching on transubstantiation
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Magna Carta was a charter that declared that the King could not levy taxes without consent of the kingdom, all had a right to trial by jury, and the prohibition of arbitrary arrests.