Only the Western Roman Empire fell, while the Eastern Empire called Byzantium survived and helped preserve Greek and Roman works. Literacy declined greatly after the fall of Rome, with only the nobility and clergy able to read. The Christian church became the main source of education and banned secular entertainments like theater, though some forms like mimes, jugglers and puppetry survived. Nuns helped revive theater by writing religious plays to teach lessons to their students in Latin. These religious plays evolved into morality plays and mystery plays performed by traveling theater troupes. Eventually, professional secular theater emerged during the Renaissance as the church withdrew support from dramatic performances.