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The Crusades were military expeditions supported by the Catholic Church during the Middle Ages to conquer for Holy Land, which was in the hands of the Seleucid Turks.
The first crusade responded to a call by Pope Urban II in 1095 AD to recover the Holy Land, recently lost by the Byzantine Empire after the Seleucid Turks invasion. Kings and knights from all over Europe organized to participate.
Between 1096 AD and 1291 AD 8 crusades were held. Most of them were intended to recover Holy Land for Christianity, but there was one against the Moores in Spanish territories, and another one focused on fighting the Cathars heretic movement.
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Because they were so close to these rivers, they serve as sources of drinking water. What gave opportunity for people to settle and become sedentary, focusing initially on agriculture and land security, with this the population grew and avoided the risks of nomadic communities, not having to go to places unknown or dangerous or run out of food. Therefore, over time they then focused on more complex areas such as politics, economy and architecture. Promoting the development of the community that over the years were the foundations of modern civilization.
