Before medieval times, Christianity had spread through the Roman world and the Church had set up its own government by the time the Western Roman Empire fell. As time went by differences in practices as well as in beliefs arose between the church in the western Mediterranean areas and the Church in the eastern Mediterranean regions. They even did not use the same language. After 1054, the Church was pided into the Roman Catholic Church and the Eastern Orthodox Church. In order to develop a civilization based on Christianity, the Catholic Church made Latin the official language and helped to preserve and pass on the heritage of the Roman Empire. 浅析欧洲中世纪骑士精神(5):http://www.youerw.com/yingyu/lunwen_12420.html