 With the discussion of Trinitarian doctrine now developed and well under agreement to orthodox and biblical understanding, the focus of discussion changed to Christology, which would be the topic of the Council of Ephesus of 431 and the Council of Chalcedon of 451.David Eastman cites the First Council of Constantinople as another example of the waning influence of Rome over the East.He notes that all three of the presiding bishops came from the East.