In the year before the First Council of Constantinople in 381, Nicene Christianity became the official religion of the Roman Empire when Theodosius I, emperor of the East, Gratian, emperor of the West
Monogramme of Christ (the Chi Rho) on a plaque of a sarcophagus, 4th-century AD, marble, Musei Vaticani, on display in a temporary exhibition at the Colosseum in Rome, Italy
Icon depicting Constantine and the bishops of the Council of Nicaea (325). The centrally placed and haloed Emperor holds the Creed of the First Council of Constantinople (381).
Missorium of Emperor Theodosius I, who declared Nicene Christianity to be the State religion of the Roman Empire. This piece was found in Almendralejo, Spain.
The Hagia Sophia basilica in Constantinople, for centuries the largest church building in the world.
East–West Schism
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The East–West Schism, also known as the Great Schism or the Schism of 1054, is the break of communion between the Catholic Church and the Eastern Orthodox Church since 1054. A series of ecclesiastical
Hagia Sophia, the cathedral of Constantinople at the time of the schism
The division between the Eastern and Western Churches
Commemorative tablet of Catholic-Orthodox prayer at Saint Peter's Basilica, commemorating the meetings held between Pope Paul VI and Patriarch Athenagoras in 1967, and between Pope John Paul II and Patriarch Demetrios I of Constantinople in 1987.