Arianism is a Christological doctrine considered heretical by all modern mainstream branches of Christianity. It is first attributed to Arius, a Christian presbyter who preached and studied in Alexandria, Egypt. Arian theology holds that Jesus Christ is the Son of God, who was begotten by God the Father with the difference that the Son of God did not always exist but was begotten/made before time by God the Father; therefore, Jesus was not coeternal with God the Father, but nonetheless Jesus began to exist outside time.
Athanasius I of Alexandria, also called Athanasius the Great, Athanasius the Confessor, or, among Coptic Christians, Athanasius the Apostolic, was a Christian theologian and the 20th patriarch of Alexandria. His intermittent episcopacy spanned 45 years, of which over 17 encompassed five exiles, when he was replaced on the order of four different Roman emperors. Athanasius was a Church Father, the chief proponent of Nicene theology against the anti-Nicenes, and a noted Egyptian Christian leader of the fourth century.
The 360s decade ran from January 1, 360, to December 31, 369.
Pope Liberius was the bishop of Rome from 17 May 352 until his death. According to the Catalogus Liberianus, he was consecrated on 22 May as the successor to Julius I. He is not mentioned as a saint in the Roman Martyrology. That makes him the earliest pontiff not to be venerated as a saint in the Catholic Church and, along with Anastasius II, one of only two popes to be omitted from Catholic sainthood in the first 500 years of church history.
Hilary of Poitiers was Bishop of Poitiers and a Doctor of the Church. He was sometimes referred to as the "Hammer of the Arians" and the "Athanasius of the West". His name comes from the Latin word for happy or cheerful. In addition to his important work as bishop, Hilary was married and the father of Abra of Poitiers, a nun and saint who became known for her charity.
Saint Meletius was a Christian bishop of Antioch from 360 until his death in 381. However, his episcopate was dominated by a schism, usually called the Meletian schism.
Paul I or Paulus I or Saint Paul the Confessor, was the sixth bishop of Constantinople, elected first in 337 AD. Paul became involved in the Arian controversy which drew in the Emperor of the West, Constans, and his counterpart in the East, his brother Constantius II. Paul was installed and deposed three times from the See of Constantinople between 337 and 351. He was murdered by strangulation during his third and final exile in Cappadocia. His feast day is on November 6.
Maximin was the sixth bishop of Trier. Maximin was an opponent of Arianism, and was supported by the courts of Constantine II and Constans, who harboured as an honored guest Athanasius twice during his exile from Alexandria, in 336–37 and again in 343. In the Arian controversy he had begun in the party of Paul I of Constantinople; however, he took part in the synod of Sardica convoked by Pope Julius I, and when four Arian bishops consequently came from Antioch to Trier with the purpose of winning Emperor Constans to their side, Maximinus refused to receive them and induced the emperor to reject their proposals.
Eustathius of Antioch, sometimes surnamed the Great, was a Christian bishop and archbishop of Antioch in the 4th century. His feast day in the Eastern Orthodox Church is February 21.
Eusebius of Vercelli was a bishop from Sardinia and is counted a saint. Along with Athanasius, he affirmed the divinity of Jesus against Arianism.
Semi-Arianism was a position regarding the relationship between God the Father and the Son of God, adopted by some 4th-century Christians. Though the doctrine modified the teachings of Arianism, it still rejected the doctrine that Father, Son, and Holy Spirit are co-eternal, and of the same substance, or consubstantial, and was therefore considered to be heretical by many contemporary Christians.
Lucifer of Cagliari was a bishop of Cagliari in Sardinia known for his passionate opposition to Arianism. He is sometimes venerated as a Saint in Sardinia, though his status remains controversial.
Saint Servatius was bishop of Tongeren. Servatius is patron saint of the city of Maastricht and the towns of Schijndel and Grimbergen. He is one of the Ice Saints. His feast day is May 13.
Auxentius of Milan or of Cappadocia, was an Arian theologian and bishop of Milan. Because of his Arian faith, Auxentius is considered by the Catholic Church as an intruder and he is not included in the Catholic lists of the bishops of Milan such as that engraved in the Cathedral of Milan.
January 12 - Eastern Orthodox liturgical calendar - January 14
Saturninus of Arles was a Gallo-Roman Arian bishop of Arles in the early 4th century who under Constantius II was Primate of Gaul. He is known for his opposition to Saint Hilary of Poitiers, bishop of Poitiers, at the Church Council of Arles of 353.
The Pneumatomachi, also known as Macedonians or Semi-Arians in Constantinople and the Tropici in Alexandria, were an anti-Nicene Creed sect which flourished in the regions adjacent to the Hellespont during the latter half of the fourth, and the beginning of the fifth centuries. They denied the godhood of the Holy Ghost, hence the Greek name Pneumatomachi or 'Combators against the Spirit'.
Gaul was an important early center of Latin Christianity during late antiquity and the Merovingian period. By the middle of the 3rd century, there were several churches organized in Roman Gaul, and soon after the cessation of persecution, the bishops of the Latin world assembled at Arles in AD 314. The Church of Gaul passed through three crises in the late Roman period, Arianism, Priscillianism and Pelagianism. Under Merovingian rule, a number of "Frankish synods" were held, marking a particularly Germanic development in the Western Church. A model for the following Frankish synods was set by Clovis I, who organized the First Council of Orléans (511).
Paulinus II was a claimant to the See of Antioch from 362 to 388.
Bonosus of Trier was bishop of Trier.
