Deemed a heretic by the Ecumenical First Council of Nicaea of 325, Arius was later exonerated in 335 at the regional First Synod of Tyre, and then, after his death, pronounced a heretic again at the Ecumenical First Council of Constantinople of 381.

By 325, the controversy had become significant enough that the Emperor Constantine called an assembly of bishops, the First Council of Nicaea, which condemned Arius ' doctrine and formulated the original Nicene Creed of 325.

In 325, at the age of 27, Athanasius had a leading role against the Arians in the First Council of Nicaea.

In 325, he served as Alexander's secretary at the First Council of Nicaea.

Athanasius may have accompanied Alexander to the First Council of Nicaea in 325, the council which produced the Nicene Creed and anathematized Arius and his followers.

However, early church documents, such as those of the First Council of Nicaea ( 325 ) had always listed the Pope of Rome first among the Ancient Patriarchs ( first four, and later five: Rome, Constantinople, Alexandria, Antioch and Jerusalem — collectively referred to as the Pentarchy ).

An Eastern Christianity | Eastern Christian Icon depicting Constantine I and Christianity | Emperor Constantine and the Fathers of the First Council of Nicaea ( 325 ) as holding the Niceno – Constantinopolitan Creed of 381.

The Nicene Creed, largely a response to Arianism, was formulated at the Councils of Nicaea and Constantinople in 325 and 381 respectively and ratified as the universal creed of Christendom by the First Council of Ephesus in 431.

Early Christendom would close at the end of imperial persecution of Christians after the ascension of Constantine the Great and the Edict of Milan in AD 313 and the First Council of Nicaea in 325.

In 325, the first ecumenical council ( First Council of Nicaea ) determined that Jesus Christ was God, " consubstantial " with the Father, and rejected the Arian contention that Jesus was a created being.

Icon depicting Constantine I and Christianity | Emperor Constantine ( center ) and the Fathers of the First Council of Nicaea ( 325 ) as holding the Niceno-Constantinopolitan Creed of 381

One of the most widely used creeds in Christianity is the Nicene Creed, first formulated in AD 325 at the First Council of Nicaea.

The Nicene Creed reflects the concerns of the First Council of Nicaea in 325 which had as their chief purpose to establish what Christians believed.

" These are likely the same Cathari mentioned in Canon 8 of the First Ecumenical Council of Nicaea in 325 AD, which states "... f those called Cathari come over the Catholic faith, let them first make profession that they are willing to communicate full communion with the twice-married, and grant pardon to those who have lapsed ..."

Docetism was unequivocally rejected at the First Council of Nicaea in 325 and is regarded as heretical by the Catholic Church, Orthodox Church, and many others.

The First Council of Nicaea ( 325 ) established the date of Easter as the first Sunday after the full moon ( the Paschal Full Moon ) following the northern hemisphere's vernal equinox.

This controversy between those who advocated independent computations, and those who wished to continue the custom of relying on the Jewish calendar, was formally resolved by the First Council of Nicaea in 325 ( see below ), which endorsed the move to independent computations, effectively requiring the abandonment of the old custom of consulting the Jewish community in those places where it was still used.

The First Council of Nicaea ( 325 ) established the date of Easter as the first Sunday after the full moon ( the Paschal Full Moon ) following the northern hemisphere's vernal equinox.

At the First Council of Nicaea in 325 it was decided that all Christian churches would celebrate Easter on the same day, which would be computed independently of any Jewish calculations to determine the date of Passover.

In the history of Christianity, the First seven Ecumenical Councils, from the First Council of Nicaea ( 325 ) to the Second Council of Nicaea ( 787 ), represent an attempt to reach an orthodox consensus and to unify Christendom under the State church of the Roman Empire.

# First Council of Nicaea ( 325 ) repudiated Arianism, declared that Christ is " homoousios with the Father " ( of the same substance as the Father ), and adopted the original Nicene Creed, fixed Easter date ; recognized primacy of the sees of Rome, Alexandria and Antioch and granted the See of Jerusalem a position of honor.

In 381, at the Second Ecumenical Council in Constantinople, a group of mainly Eastern bishops assembled and accepted the Nicene Creed of 381, which was supplemented in regard to the Holy Spirit, as well as some other changes: see Comparison between Creed of 325 and Creed of 381.

The Ecumenical Council of Nicea AD 325 was convened by Constantine under the presidency of Saint Hosius of Cordova and Pope Saint Alexander I of Alexandria to resolve the dispute and eventually led to the formulation of the Symbol of Faith, also known as the Nicene Creed.

The Roman persecution of Christians ended in AD 313 under the reign of Constantine the Great, who in 325 prompted the First Council of Nicaea, the beginning of the period of the First seven Ecumenical Councils.

* 325 – The First Council of Nicea – the first Ecumenical Council of the Christian Church is held.

The third Ecumenical Council ( Council of Ephesus of 431 ) reaffirmed the original 325 version of the Nicene Creed and declared that " it is unlawful for any man to bring forward, or to write, or to compose a different ( – more accurately translated as used by the Council to mean “ different ,” “ contradictory ,” and not “ another ”) Faith as a rival to that established by the holy Fathers assembled with the Holy Ghost in Nicæa " ( i. e. the 325 creed ) This statement has been interpreted as a prohibition against changing this creed or composing others, but not all accept this interpretation.

Oriental Orthodoxy refers to the churches of Eastern Christian tradition that keep the faith of the first three Ecumenical Councils of the undivided Church: the First Council of Nicaea ( AD 325 ), the First Council of Constantinople ( 381 ) and the Council of Ephesus ( 431 ), and rejected the dogmatic definitions of the Council of Chalcedon ( 451 ).

The first seven Ecumenical Councils, from the First Council of Nicaea ( 325 ) to the Second Council of Nicaea ( 787 ), represent an attempt to reach an orthodox consensus and to establish a unified Christendom as the State church of the Roman Empire.

At the First Ecumenical Council, held in 325 at Nicaea, it was decided to celebrate Easter on the Sunday following the so-called Paschal Full Moon, as for the Christian church to differentiate itself from their Jewish counterparts.

Afterwards, in 325 the First Ecumenical Council at Nicaea promulgated a creed which was amended at the subsequent First Council of Constantinople in 381.

According to churches that consider ecumenical council decisions final, trinitarianism was infallibly defined at the First Ecumenical Council ( the Council of Nicaea ) in 325 A. D. Nontrinitarians disagree with the findings of the Council for various reasons, including the belief that the Bible as they understand it takes precedence over creeds, or that there was a Great Apostasy prior to the Council.

After about the year 200, Christian art is divided into two periods by scholars: before and after the First Council of Nicea in 325, before being the Ante-Nicene Period and after being the period of the First seven Ecumenical Councils.

* 325 – The Ecumenical Council of Nicaea.

Writing around 330, the first great recorded Church historian Eusebius of Caesarea mentions that bishops from Epiros attended the first Ecumenical Council of Nicaea in 325.

The Second Ecumenical Council whose additions to the Nicene Creed # The original Nicene Creed of 325 | original Nicene Creed lay at the heart of one of the theological disputes associated with the East – West Schism.

When the Roman Emperor Constantine the Great legalized Christianity, he summoned the First Ecumenical Council at Nicaea in 325 to resolve a number of issues which troubled the Church.

Eastern Orthodox argue that the seventh canon of the Council of Ephesus explicitly prohibited modification of the Nicene Creed by any man ( not by Ecumenical church council ) drawn up by the first Ecumenical Council in 325.

Important theological debates also surrounded the various Ecumenical Councils – Nicaea in 325, Constantinople in 381, Ephesus in 431 and Chalcedon in 451

First Ecumenical Council, 325.

Woollcombe also states that no one questioned the apostolicity of the See of Alexandria despite the fact that its Popes were consecrated by the college of presbyters up till the time of the Council of Nicaea in 325.

The Trinity had been recognized at the Council of Nicea in 325, but debate about exactly what it meant continued.

" Jesus that I know as my Redeemer cannot be less than God " ~ at the Council of Nicæa ( c. 325 )

The Council of Nicea in 325 had noted the primacy of the See of Rome, followed by the Sees of Alexandria and Antioch.