B. they temporarily moved to the lowlands
The factor that led to the decline of the Byzantine empire was the fact that Church leaders fought with the emperors over who ruled the empire.
<h3>What caused the Byzantine to fall?</h3>
The Byzantine was known to have faced a collapse due to a number of reasons. The Ottomans had breached the area.
The use of canons on the walls of the city also contributed to its fall after the they faced.
Read more on the Byzantine empire here:
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