The crusades had a major effect of Europe. The Crusades brought in many new things such as spices and fabrics. Not only that, but also they reintroduced many ideas. One idea that was reintroduced was medicine. A Muslim doctor named Avicenna, had written down many of the ideas from many great doctors in the years before. Some ideas that we wrote down were from great Roman and Greek doctors such as Galen and Hippocrates. He also added some of his own ideas. This helps the European people rediscover how blood circulates around the body. Another Affect is that Arabic numbers make up maths today. Muslims invented Algebra and alchemy which led to chemistry. It would be hard for schools without the Crusades. A game that was brought back was the game
