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 pope 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 Trinitarianism against Arianism, and a noted Egyptian Christian leader of the fourth century.
Gnosticism is a collection of religious ideas and systems that coalesced in the late 1st century AD among Jewish and early Christian sects. These various groups emphasized personal spiritual knowledge (gnosis) above the proto-orthodox teachings, traditions, and authority of religious institutions.
Pope Siricius was the bishop of Rome from December 384 to his death. In response to inquiries from Bishop Himerius of Tarragona, Siricius issued the Directa decretal, containing decrees of baptism, church discipline and other matters. His are the oldest completely preserved papal decretals. He is sometimes said to have been the first bishop of Rome to call himself pope.
Sulpicius Severus was a Christian writer and native of Aquitania in modern-day France. He is known for his chronicle of sacred history, as well as his biography of Saint Martin of Tours. He is venerated as a Saint in the Eastern Orthodox Church.
Priscillian was a wealthy nobleman of Roman Hispania who promoted a strict form of Christian asceticism. He became bishop of Ávila in 380. Certain practices of his followers were denounced at the Council of Zaragoza in 380. Tensions between Priscillian and bishops opposed to his views continued, as well as political maneuvering by both sides. Around 385, Priscillian was charged with sorcery and executed by authority of the Emperor Maximus. The ascetic movement Priscillianism is named after him, and continued in Hispania and Gaul until the late 6th century. Tractates by Priscillian and close followers, which were thought lost, were discovered in 1885 and published in 1889.
Bogomilism was a Christian neo-Gnostic, dualist sect founded in the First Bulgarian Empire by the priest Bogomil during the reign of Tsar Peter I in the 10th century. It most probably arose in the region of Kutmichevitsa, today part of the region of Macedonia.
Pelagius was a British (Brittonic) theologian known for promoting a system of doctrines which emphasized human choice in salvation and denied original sin. Pelagius was accused of heresy at the synod of Jerusalem in 415 and his doctrines were harshly criticized by Augustine of Hippo, especially the Pelagian views about mankind's good nature and individual responsibility for choosing asceticism. Pelagius especially stressed the freedom of human will. Very little is known about the personal life and career of Pelagius.
Hydatius, also spelled Idacius was a late Western Roman writer and clergyman. The bishop of Aquae Flaviae in the Roman province of Gallaecia, he was the author of a chronicle of his own times that provides us with our best evidence for the history of Hispania in the 5th century.
The Euchites or Messalians were a Christian sect from Mesopotamia that spread to Asia Minor and Thrace. The name 'Messalian' comes from the Syriac ܡܨܠܝܢܐ, mṣallyānā, meaning 'one who prays'. The Greek translation is εὐχίτης, euchitēs, meaning the same.
Epiphanius of Salamis was the bishop of Salamis, Cyprus, at the end of the 4th century. He is considered a saint and a Church Father by both the Eastern Orthodox and Catholic Churches. He gained a reputation as a strong defender of orthodoxy. He is best known for composing the Panarion, a compendium of eighty heresies, which included also pagan religions and philosophical systems. There has been much controversy over how many of the quotations attributed to him by the Byzantine Iconoclasts were actually by him. Regardless of this, he was clearly strongly against some contemporary uses of images in the church.
Novatianism or Novationism was an early Christian sect devoted to the theologian Novatian that held a strict view that refused readmission to communion of lapsi. The Church of Rome declared the Novatianists heretical following the letters of Saint Cyprian of Carthage and Ambrose wrote against them. Novatianism survived until the 8th century.
Bardaisan, known in Arabic as ibn Dayṣān and in Latin as Bardesanes, was a Syriac-speaking Assyrian Christian writer and teacher with a gnostic background, and founder of the Bardaisanites.
Paulicianism was a heretical medieval Christian sect which originated in Armenia in the 7th century. Followers of the sect were called Paulicians and referred to themselves as Good Christians. Little is known about the Paulician faith and various influences have been suggested, including Gnosticism, Marcionism, Manichaeism and Adoptionism, with other scholars arguing that doctrinally the Paulicians were a largely conventional Christian reform movement unrelated to any of these currents.
Heresy in Christianity denotes the formal denial or doubt of a core doctrine of the Christian faith as defined by one or more of the Christian churches.
The doctrine of the Trinity, considered the core of Christian theology by Trinitarians, is the result of continuous exploration by the church of the biblical data, thrashed out in debate and treatises, eventually formulated at the First Council of Nicaea in AD 325 in a way they believe is consistent with the biblical witness, and further refined in later councils and writings. The most widely recognized Biblical foundations for the doctrine's formulation are in the Gospel of John, which possess ideas reflected in Platonism and Greek philosophy.
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).
Christianity in late antiquity traces Christianity during the Christian Roman Empire — the period from the rise of Christianity under Emperor Constantine, until the fall of the Western Roman Empire. The end-date of this period varies because the transition to the sub-Roman period occurred gradually and at different times in different areas. One may generally date late ancient Christianity as lasting to the late 6th century and the re-conquests under Justinian of the Byzantine Empire, though a more traditional end-date is 476, the year in which Odoacer deposed Romulus Augustus, traditionally considered the last western emperor.
The Church Fathers, Early Church Fathers, Christian Fathers, or Fathers of the Church were ancient and influential Christian theologians and writers who established the intellectual and doctrinal foundations of Christianity. The historical period in which they worked became known as the Patristic Era and spans approximately from the late 1st to mid-8th centuries, flourishing in particular during the 4th and 5th centuries, when Christianity was in the process of establishing itself as the state church of the Roman Empire.
The Council of Toledo of 447 was the second Council of Toledo. It was a national council held against the Priscillianists, as called for by Pope Leo I. Nineteen bishops participated in the council, which condemned the heresy and the followers of Priscillian and affirmed the earlier First Council of Toledo, on which its Creed is based. It gave a profession of faith against all heretics with 18 anathemas attached against the doctrines of Priscillian. The council is notable for its successful subduing of Priscillianism, expressing a definition of dyophysitism before the Council of Chalcedon, its affirmation of the First Council of Toledo, and being the first known western council to include the "filioque" in its creed, following in the doctrine from Pope Leo I.
