The most main reason was the christian wanted to take over the Jerusalem from the Muslims and they also believed that if they fight their sins would be wiped out. <span />
<span>When William the Conqueror became King of England in 1066 he introduced a new kind of feudal system into Britain. William confiscated the land in England from the Saxon lords and allocated it to members of his own family and the Norman lords who had helped him conquer the country.</span>
