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The Muslims kept alive the medical knowledge of the Romans after the Roman Empire collapsed in Europe (in 476AD), a time when literacy (reading and writing) was only common among Christian priests.The Muslim doctor, Avicenna, had written down all the ideas of the great Roman and Greek doctors like Galen and Hippocrates and added his own ideas to them in the 11th century AD. This book allowed Europeans to rediscover how blood circulated around the body, for example.
Without the Crusades, Muslims would not have traded medical knowledge with Europeans, we might not have paracetamol or aspirin today.

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Whether women took active part in battle during the crusader period is a much-contested issue. While there is some evidence that corpses of Latin women wearing armour were spotted among the dead on the battlefield, historians have queried whether precious war gear would be ‘wasted’ on women who were unlikely to receive military training.

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Not all the Crusaders went home after fighting the Muslims. Many of them who went to the Holy Land liked it so much that they stayed and adopted a Middle Eastern way of life, including using bathhouses and soap.

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Saladin (1137/1138–1193) was a Muslim military and political leader who as sultan (or leader) led Islamic forces during the Crusades. Saladin’s greatest triumph over the European Crusaders came at the Battle of Hattin in 1187, which paved the way for Islamic re-conquest of Jerusalem and other Holy Land cities in the Near East. During the subsequent Third Crusade, Saladin was unable to defeat the armies led by England’s King Richard I (the Lionheart), reuslting in the loss of much of this conquered territory. However, he was able to negotiate a truce with Richard I that allowed for continued Muslim control of Jerusalem.

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what were the relationships like between Christians and Muslims?

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what were the relationships like between Christians and Muslims?

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People would say that Christians and Muslims did not get along with each other(not only the people in war). However there were certain areas in Palestine were the Muslims and Christians did get along and lived together. The Crusaders that just came from places like Italy were shocked to see Muslims but others who had lived with them for so long, respected them and allowed them to practice their Religion.

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knights,old crowns and nobles went on the crusades.

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the crusades were a series of military campaigns during the time of Medieval England against the Muslims of the Middle East. In 1076, the Muslims had captured Jerusalem – the most holy of holy places for Christians.