A knight defended the church and defenseless people. This was the idea of

being a hero

Explanation:

like duh bruh a hero and hope this helps

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the conditions that made the byzantine empire vulnerable to attacks by the muslin turks were the sack of constantinople by western crusaders, the conquests of the sultanate of rum, presence of rival kingdoms and finally the set up of fiefdoms at the empire which were owned by the ghazis (turkish warriors).