What type of goverment did the leaders of the roman republic establish pl help

I believe that the Romans established as Republic which is commonly known as teh Roman Republic.

Explanation:

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).