Pope Leo I

Pope Leo I was bishop of Rome from 440 to 461. Known as Leo the Great, he strengthened papal authority and shaped early Christian doctrine, especially through his teaching on Christ.

Attila the Hun: A ruler of the Hunnic Empire who led invasions into the Roman Empire during the fifth century. Leo met Attila near Rome in 452, an encounter later remembered as a diplomatic intervention.
Bishop of Rome: The chief bishop of the Christian community in Rome, whose office developed into the papacy. Leo exercised his authority as bishop of Rome and advanced claims about the office’s primacy.
Papal primacy: The claim that the bishop of Rome holds supreme authority among Christian bishops. Leo grounded his interventions in the Roman see’s special authority among churches.
Chalcedonian Christianity: Christian traditions that accept the definition of Christ established at the Council of Chalcedon. Leo’s teaching helped establish the doctrinal position that became Chalcedonian orthodoxy.
Flavian of Constantinople: The archbishop of Constantinople who defended the doctrine that Christ has two natures. Leo’s letter to Flavian became a central text in the dispute that led to the Council of Chalcedon.
Papacy: The office and institution of the pope as head of the Roman Catholic Church. Leo’s claims about Roman primacy helped shape the papacy’s authority.
Sermons of Leo the Great: A collection of Leo’s homilies on Christian doctrine, feasts, and pastoral practice. His sermons communicated theological teaching and Roman authority to congregations.
Oriental Orthodox Churches: A family of churches that did not accept the Council of Chalcedon’s definition of Christ. Their rejection of Chalcedon marks a lasting division from the doctrine Leo supported.
Eutyches: A fifth-century archimandrite whose teaching emphasized Christ’s divine nature in a way condemned as heretical. Leo opposed Eutyches’s teaching as incompatible with Christ’s full humanity.
Christology: The branch of Christian theology concerned with the identity and nature of Jesus Christ. Leo’s most influential doctrinal work addressed how Christ is both divine and human.

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