What Is The Tome of Leo?
The Tome of Leo is a letter written in AD 449 by Pope St. Leo to St. Flavian, who was Bishop of Constantinople. Why was this letter sent? After the Council of Ephesus, there arose a new heresy spewed by a monk named Eutyches who taught that after the incarnation, Christ only had one nature, and not two natures (divine and human). Eutyches was condemned by the Bishop, but another "council" was held in defense of Eutyches' teaching and condemned Bishop St. Flavian. This council became known as the Robber Council, which is an invalid council . So, St. Flavian appealed to his brother bishop Pope St. Leo and the letter is the reply. You can read it here . The letter is significant for a few reasons. First, it is significant because it is a defense of orthodox teaching on the two natures of Christ. It was so profound, that this letter was appealed to in the next Ecumenical Council, the Council of Chalcedon, which did finally and authoritatively lay to rest the teaching of...