Do you mean the marvel civil war or the regular one
Pope Urban II calls the first crusade - this event was caused as Byzantine Emperor Alexius I made an appeal to Urban for assistance. Urban united Christian Europe to fight against the Turks to take back the Holy Land.
Urban degraded Muslims in speeches with exaggerating stories of anti-Christian acts, giving the united Christian Europe a common enemy and a promised reward.
The Christians were, however, initially beaten back due to inexperience and lack of discipline.
Hope this helps!
I believe the answer is: It was located on peninsula between Europe and Asia and lied on the cross of trade routes
This location gave constantinople a strategic location to control the trades between European traders and Asian traders. They could obtain a lot of profit by either taxing the trades that pass through their territory, or monopolizing a certain type of product themselves.
Yeah your answer is A as you can see by the picture ^^
lol