Eastern Orthodoxy

270 Antony takes up life of solitude

301 Armenia officially embraces Christianity

313 Emperor Constantine legalizes Christian church (right)

325 First Council of Nicea; Arius condemned but not defeated

328 Athanasius becomes bishop of Alexandria and fights Arianism

358 Basil the Great founds first monastery (right)

380 Christianity becomes the sole legal religion of the Roman Empire

381 First Council of Constantinople adopts Nicene Creed

398 John Chrysostom becomes bishop of Constantinople

431 First Council of Ephesus condemns Nestorius

444 Death of Cyril of Alexandria, who believed Christ had one nature after his Incarnation (monophysitism)

451 The Council of Chalcedon condemns monophysitism; monophysite Egypt, Syria, and Ethiopia break with Constantinople (right)

483 Emperor Zeno's Henotikon tries to reconcile monophysites but fails

553 The Second Constantinople Council fails to reconcile monophysites

662 Exiled Maximus the Confessor dies

680 After Third Council of Constantinople, all attempts to reconcile the monophysites cease (right)

692 "Quinisext" Council codifies canon law of Eastern church

726 Byzantine Emperor Leo III starts campaign against icons (iconoclasm); persecutes those who defend icons (right)

749 John of Damascus, first systematic theologian of the East and defender of icons, dies

787 Second Council of Nicea condemns iconoclasm

811-843 Iconoclastic campaign revived by imperial court but fails

862 Mission of Cyril and Methodius to the Slavs

867 Photius, patriarch of Constantinople, accuses Rome of heresy because of the filioque

988 Vladimir, prince of Kiev, embraces Christianity; conversion of Russia follows (right)

1014 Rome introduces filioque into its liturgy; pope no longer commemorated at Constantinople

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