Glagolitic alphabet
The foundations of the Bulgarian national Church had been set. The next stage was the implementation of the Glagolitic alphabet and the Slavonic language as official language of the Bulgarian Church and State in 893 AD. 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.