A famous work by Leonardo da Vinci that was commissioned by the Catholic Church is Mona Lisa
O La Primavera.
O The Last Supper.
O The Birth of Venus.

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).

which empire had the greatest influence on the history and cultural development of russia?

woah dude who's thia? need more info