Heresy is any belief or theory that is strongly at variance with established beliefs or customs, particularly the accepted beliefs or religious law of a religious organization. A heretic is a proponent of heresy.
Heresy in Judaism, Christianity, and Islam has at times been met with censure ranging from excommunication to the death penalty.
Isidore of Seville (Latin: Isidorus Hispalensis; c. 560 – 4 April 636) was a Hispano-Roman scholar, theologian and archbishop of Seville. He is widely regarded, in the words of the 19th-century historian Charles Forbes René de Montalembert, as "the last scholar of the ancient world".
At a time of disintegration of classical culture, aristocratic violence, and widespread illiteracy, Isidore was involved in the conversion of the Arian Visigothic kings to Catholicism, both assisting his brother Leander of Seville and continuing after Leander's death. He was influential in the inner circle of Sisebut, Visigothic king of Hispania. Like Leander, he played a prominent role in the Councils of Toledo and Seville.
Odoacer (c. 433 – 15 March 493 AD), also spelled Odovacer or Odovacar, was a barbarian soldier and statesman from the Middle Danube who was an officer of the Roman army and deposed the Western Roman child emperor Romulus Augustulus to become the ruler of Italy (476–493). Odoacer's overthrow of Romulus Augustulus is traditionally understood as marking the end of the Western Roman Empire.
Although he ruled Italy, Odoacer styled himself a client of the Eastern emperor Zeno in Constantinople. He was addressed not only as Latin: rex but also as dux and patrician, the latter title granted by Zeno. In the sole surviving document from his chancery—and by the consul Basilius—Odoacer used the title of king. Backed by the Roman Senate, he distributed land with little resistance. Soldier unrest in 477–478 caused violence, but his later reign was stable. Though an Arian, he seldom interfered in the Trinitarian state church.
During the reign of the Roman emperor Constantine the Great (306–337 AD), Christianity began to transition to the dominant religion of the Roman Empire. Historians remain uncertain about Constantine's reasons for favoring Christianity, and theologians and historians have often argued about which form of early Christianity he subscribed to. There is no consensus among scholars as to whether he adopted his mother Helena's Christianity in his youth, or, as claimed by Eusebius of Caesarea, encouraged her to convert to the faith he had adopted.
Constantine ruled the Roman Empire as sole emperor for much of his reign. Some scholars allege that his main objective was to gain unanimous approval and submission to his authority from all classes, and therefore he chose Christianity to conduct his political propaganda, believing that it was the most appropriate religion that could fit with the imperial cult. Regardless, under the Constantinian dynasty Christianity expanded throughout the empire, launching the era of the state church of the Roman Empire. Whether Constantine sincerely converted to Christianity or remained loyal to paganism is a matter of debate among historians. His formal conversion in 312 is almost universally acknowledged among historians, despite that it was claimed he was baptized only on his deathbed by the Arian bishop Eusebius of Nicomedia in 337; the real reasons behind it remain unknown and are debated also.
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, and Gratian's junior co-ruler Valentinian II issued the Edict of Thessalonica in 380, which recognized the catholic orthodoxy, as defined by the Council of Nicea, as the Roman Empire's state religion. Historians refer to this state-sponsored church using a variety of terms: the catholic church, the orthodox church, the imperial church, the Roman church, or the Byzantine church, with some also used for wider communions extending beyond the Roman Empire. The Eastern Orthodox Church, Oriental Orthodoxy, and the Catholic Church all claim to stand in continuity from the Nicene Christian church to which Theodosius granted recognition. Political differences between the Eastern Roman Empire and the Persian Sassanid Empire led to the separation of the Church of the East in 424. A doctrinal split within the imperial church led to the independence of early Oriental Orthodoxy, while the fall of the Western Roman Empire initiated the gradual separation between Eastern and Western Christianity, culminating in the East-West schism of 1054. The Western Church evolved into the Latin Catholic Church while the Eastern Church that remained under the patronage of the Eastern empire and evolved into the Greek Orthodox Church.
Earlier in the 4th century, following the Diocletianic Persecution of 303–313 and the Donatist controversy that arose in consequence, Constantine the Great had convened councils of bishops to define the orthodoxy of the Christian faith and to expand on earlier Christian councils. A series of ecumenical councils convened by successive Roman emperors met during the 4th and the 5th centuries, but Christianity continued to suffer rifts and schisms surrounding the theological and christological doctrines of Arianism, Nestorianism, Miaphysitism, and Dyophysitism. In the 5th century, the Western Roman Empire decayed as a polity; invaders sacked Rome in 410 and in 455, and Odoacer, an Arian barbarian warlord, forced Romulus Augustus, the last nominal Western Emperor, to abdicate in 476. However, apart from the aforementioned schisms, the church as an institution persisted in communion, if not without tension, between the East and West. In the 6th century, the Byzantine armies of the Byzantine Emperor Justinian I recovered Italy and other regions of the Western Mediterranean shore. The Byzantine Empire soon lost most of these gains, but it held Rome, as part of the Exarchate of Ravenna, until 751, a period known in church history as the Byzantine Papacy. The early Muslim conquests of the 7th–9th centuries would begin a process of converting most of the then-Christian world in the Levant, Middle East, North Africa, regions of Southern Italy and the Iberian Peninsula to Islam, severely restricting the reach both of the Byzantine Empire and of its church. Christian missionary activity directed from the capital of Constantinople did not lead to a lasting expansion of the formal link between the church and the Byzantine emperor, since areas outside the Byzantine Empire's political and military control set up their own distinct churches, as in the case of Bulgaria in 919.
Basil of Caesarea, also called Saint Basil the Great (330 – 1 or 2 January 379) was an early Roman Christian prelate who served as Bishop of Caesarea in Cappadocia from 370 until his death in 379. He was an influential theologian who supported the Nicene Creed and opposed heresies within the early Christian church such as Arianism and Apollinarianism.
In addition to his work as a theologian, Basil was known for his care of the poor and underprivileged. Basil established guidelines for monastic life which focus on community life, liturgical prayer, and manual labor. Together with Pachomius, he is remembered as a father of communal monasticism in Eastern Christianity. He is considered a saint by the traditions of both Eastern and Western Christianity.
Gothic is an extinct East Germanic language that was spoken by the Goths. It is known primarily from the Codex Argenteus, a 6th-century copy of a 4th-century Bible translation, and is the only East Germanic language with a sizeable text corpus. All others, including Burgundian and Vandalic, are known, if at all, only from proper names that survived in historical accounts, and from loanwords in other, mainly Romance languages.
As a Germanic language, Gothic is a part of the Indo-European language family. It is the earliest Germanic language that is attested in any sizable texts, but it lacks any modern descendants. The oldest documents in Gothic date back to the fourth century. The language was in decline by the mid-sixth century, partly because of the military defeat of the Goths at the hands of the Franks, the elimination of the Goths in Italy, and geographic isolation (in Spain, the Gothic language lost its last and probably already declining function as a church language when the Visigoths converted from Arianism to Nicene Christianity in 589). The language survived as a domestic language in the Iberian Peninsula (modern-day Spain and Portugal) as late as the eighth century. Gothic-seeming terms are found in manuscripts subsequent to this date, but these may or may not belong to the same language.
Pope Julius I was the bishop of Rome from 6 February 337 to his death on 12 April 352. He was appealed to by Athanasius when the latter was deposed from his position as patriarch by Arian bishops, Julius then supported Athanasius and condemned his deposition as unjust. He was notable for asserting the authority of the pope over the Arian Eastern bishops, as well as being attributed with the setting of December 25 as the official birthdate of Jesus.
Arius (/əˈraɪəs, ˈɛəri-/; Koine Greek: Ἄρειος, romanized: Áreios; 250 or 256 – 336) was a Cyrenaic presbyter and ascetic. He has been regarded as the founder of Arianism, which holds that Jesus Christ was not coeternal with God the Father, but was rather created by God the Father. Arian theology and its doctrine regarding the nature of the Godhead showed a belief in radical subordinationism, a view notably disputed by 4th century figures such as Athanasius of Alexandria.
Constantine the Great's formal decriminalization of Christianity into the Roman Empire entailed the convention of ecumenical councils to remove theological divisions between opposing sects within the Church. Arius's theology was a prominent topic at the First Council of Nicaea, where Arianism was condemned in favor of Homoousian conceptions of God and Jesus. Opposition to Arianism remains embodied in the Nicene Creed, described as "a deliberately anti-Arian document." Nevertheless, despite concerted opposition, Arian churches persisted for centuries throughout Europe (especially in various Germanic kingdoms), the Middle East, and North Africa. They were suppressed by military conquest or by voluntary royal conversion between the fifth and seventh centuries.