sentences:  St. Clement, St. Naum and St. Angelaruis returned to Bulgaria, where they managed to instruct several thousand future Slavonic clergymen in the rites using the Slavic language and the Glagolitic alphabet.In 893 AD, Bulgaria expelled its Byzantine clergy and proclaimed the Slavonic language as the official language of the Bulgarian Church and State.In the 11th century the East–West Schism took place between Rome and Constantinople, resulting in a separation between the Catholic Church and the Orthodox Church (with both claiming to represent the sole legitimate continuation of the original Church).