Answer:
1. Missionary work
2. The Avars turned against the Byzantines after initially helping them fight the Slavs.
Explanation:
1. Cyril and Methodius were brothers and were born in the 9th century, amidst the Constantine Empire. they became great missionaries, being recognized throughout the empire, mainly because of their strong teachings, since they received a quality education in Constantinople, masterfully mastering concepts such as philosophy, grammar, rhetoric, music, arithmetic, geography and astronomy, in addition to Greek and Latin.
2. The Avars were allies of the Byzantines during the battles against the Slavs, being very influential for the victory of the Byzantines and the strengthening of the empire, however after the change of rulers and in the midst of an economic crisis, they decided to turn against the Byzantines and collect very high fees that contributed to the overthrow of the empire.
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