Editing Chalcedonian Definition (section)

==Context==
The Council of Chalcedon was summoned to consider the Christological question in light of the "one-nature" view of Christ proposed by [[Eutyches]], [[archimandrite]] at Constantinople, which prevailed at the [[Second Council of Ephesus]] in 449, sometimes referred to as the "Robber Synod".<ref name="episcopalchurch.org" />

The Council first solemnly ratified the [[Nicene Creed]] adopted in 325 and that creed as amended by the [[First Council of Constantinople]] in 381. It also confirmed the authority of two synodical letters of [[Cyril of Alexandria]] and the [[Leo's Tome|letter of Pope Leo I to Flavian of Constantinople]].{{sfn|Bindley|1899|p=225}}