Who is the first person to use the pen.

John J Loud

Explanation:

The first patent on a  pen was issued on October 30, 1888, to John J Loud

because other regions has other things that egypt doesnt have.

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).