Original: He was accused by his political enemy Cyril of Alexandria of a heresy that later bore his name , Nestorianism , because he objected to the popular practice of calling the Virgin Mary the '' Mother of God '' theotokos ; he instead preached that '' Mother of Christ '' would be more fitting .
Simplified: History He was blamed by his political enemy , Cyril of Alexandria of Nestorianism , for objecting to the popular practice of calling the Virgin Mary the '' Mother of God '' theotokos .