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In the year before the First Council of Constantinople in 381, Christianity became the official religion of the Roman Empire when Theodosius I, emperor of the East, Gratian, emperor of the West, and Gratian's junior co-ruler Valentinian II issued the Edict of Thessalonica in 380, [1] which recognized the catholic orthodoxy [a] of Nicene Christians as the Roman Empire's state religion.
Theodosius I (Ancient Greek: Θεοδόσιος Theodosios; 11 January 347 – 17 January 395), also known as Theodosius the Great, was a Roman emperor from 379 to 395. He won two civil wars and was instrumental in establishing the Nicene Creed as the orthodox doctrine for Nicene Christianity.
Theodosius I, who established Christianity as the official religion of the Roman Empire, died in 395 and was the last emperor to rule over a united Roman Empire; following his death, the division into western and eastern halves, each under its own emperor, became permanent.
On February 27, 380, the Roman Empire officially adopted Trinitarian Nicene Christianity as its state religion. [8] Prior to this date, Constantius II (337-361) and Valens (364-378) had personally favored Arian or Semi-Arianism forms of Christianity, but Valens' successor Theodosius I supported the Trinitarian doctrine as expounded in the Nicene Creed.
In 380, under Emperor Theodosius, Christianity became the state religion of the Roman Empire by the Edict of Thessalonica, a decree of the Emperor which would persist until the fall of the Western Roman Empire, and later, with the Byzantine (Eastern Roman) Empire, until the Fall of Constantinople.
Christianity then rapidly grew in the 4th century, accounting for 56.5% of the Roman population by 350. [43] By the latter half of the second century, Christianity had spread east throughout Media, Persia, Parthia, and Bactria. The twenty bishops and many presbyters were more of the order of itinerant missionaries, passing from place to place ...
When Theodosius ascended to the imperial throne in 380, he began on a campaign to bring the Eastern Church back to Nicene Christianity. Theodosius wanted to further unify the entire empire behind the orthodox position and decided to convene a church council to resolve matters of faith and discipline.
380, February 27: Emperor Theodosius I issues the Edict of Thessalonica, declaring Nicene Christianity as the state church of the Roman Empire [60] 380, November 24: Emperor Theodosius I is baptised 381 First Council of Constantinople , 2nd ecumenical : Jesus had true human soul, Nicene Creed of 381