Answer
Nestorius, a 5th-century patriarch, rejected the title Theotokos, which translates to "God-bearer," for Mary, the mother of Jesus. He argued that Mary should instead be called "Christotokos," meaning "bearer of Christ," as he believed that only Christ was truly divine, while Mary was a mere human vessel. This theological stance sparked the Nestorian controversy and ultimately led to Nestorius' condemnation as a heretic by the Council of Ephesus in 431.