Flavian of Constantinople was a prominent Christian bishop who served as the Patriarch of Constantinople from 446 to 449 AD. He is best known for his role in the theological disputes of the time, particularly regarding the nature of Christ. Flavian opposed the teachings of Eutyches, who promoted a monophysite view, asserting that Christ had only one divine nature. Flavian's leadership was marked by his commitment to the decisions made at the Council of Chalcedon in 451 AD, which affirmed the dual nature of Christ as both fully divine and fully human. His tenure ended tragically when he was deposed and died shortly after the Second Council of Ephesus in 449 AD, often referred to as the "Robber Council."