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The Council of Piacenza was a mixed synod of ecclesiastics and laymen of the Roman Catholic Church.
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The Council of Clermont was a mixed synod of ecclesiastic and laymen of the Catholic Church.
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Pope Urban ll launches the crusades by calling all Christians in Europe to war against Muslims in order to reclaim the Holy Land.
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The First Crusade was a series of religious wars between Christians and Muslims started primarily to secure control of holy sites considered sacred by both groups.
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The second crusade was the second major crusade launched from Europe as a Catholic holy war against Islam.
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The Third Crusade was an attempt to retake the Crusader states in the Levant that had fallen to Muslim leader Saladin in 1187 as a result of his victory in the Battle of Hattin.
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The Fourth Crusade was a Latin Christian armed expedition called by Pope Innocent lll.