Because he spent most of his career in a monastery in Antioch, and because he was so associated with Antiochene Christology, the Eastern Orthodox Church came to be popularly named for him.  
Because he spent most of his career in a monastery in Antioch, and because he was so associated with Antiochene Christology, the Eastern Orthodox Church came to be popularly named for him.  He first became an activist in his opposition to the use of the term Theotokos, which led to his eventual censure at the 431 Council of Ephesus.  Of his writings, The Bazaar of Heracleides was only rediscovered in 1895, and he is chiefly remembered for the Counter Anathemas, a response to the twelve anathemas leveled against him by St. Cyril of Alexandria.  For 10 points, who was this 5th century heretic, who actually may not have promulgated the notion that there are two separate persons in the incarnate Christ, one divine and one human?
Because he spent most of his career in a monastery in Antioch, and because he was so associated with Antiochene Christology, the Eastern Orthodox Church came to be popularly named for him.  
Nestorius (accept Nestorianism)