1. Took a giant step forward during the reign of Heraklios (AD 610-641), when he made Greek the official language of the Byzantine state
2. Up to now Latin was still the official language of the government, while Greek was the spoken and written common tongue
3. Heraklios did away with this cumbersome two-language system, and favored the language which was primary, the Greek
4. The church had also been a strong influence on this decision, Greek having been used as its language from its inception
5. The knowledge of Latin was lost within a single generation, except for some scholars