"Nestorian" refers to the theological beliefs associated with Nestorius, a 5th-century Christian theologian and Patriarch of Constantinople. He is known for his controversial views on the nature of Christ, particularly the distinction between Christ's divine and human natures. Nestorius argued that these two natures were separate, which led to accusations of heresy and the eventual condemnation of his teachings at the Council of Ephesus in 431 AD. The term "Nestorian" is also used to describe the Nestorian Church, a branch of the Eastern Christian tradition that emerged from Nestorius's teachings. This church spread throughout the Middle East and Asia, establishing communities in places like Persia and China. Nestorianism emphasizes the importance of both the human and divine aspects of Christ, influencing various theological discussions in early Christianity.