HeterodoxyIn religion, heterodoxy (from Ancient Greek: , "other, another, different" + , "popular belief") means "any opinions or doctrines at variance with an official or orthodox position". Under this definition, heterodoxy is similar to unorthodoxy, while the adjective 'heterodox' could be applied to a dissident. Heterodoxy is also an ecclesiastical term of art, defined in various ways by different religions and churches.
SocinianismSocinianism (səˈsɪniənɪzəm) is a Nontrinitarian Christian belief system developed and co-founded during the Protestant Reformation by the Italian Renaissance humanists and theologians Lelio Sozzini (Latin: Laelius Socinus) and Fausto Sozzini (Latin: Faustus Socinus), uncle and nephew, respectively. It was developed among the Polish Brethren in the Polish Reformed Church between the 16th and 17th centuries, and embraced by the Unitarian Church of Transylvania during the same period.
NestorianismNestorianism is a term used in Christian theology and Church history to refer to several mutually related but doctrinally distinct sets of teachings. The first meaning of the term is related to the original teachings of Christian theologian Nestorius ( () 450 AD), who promoted specific doctrines in the fields of Christology and Mariology. The second meaning of the term is much wider, and relates to a set of later theological teachings, that were traditionally labeled as Nestorian, but differ from the teachings of Nestorius in origin, scope and terminology.
AriusArius (əˈraɪəs,_ˈɛəri-; Ἄρειος, Áreios; 250 or 256 – 336) was a Cyrenaic presbyter, ascetic, and priest associated with the doctrine of Arianism. His teachings about the nature of the Godhead in Christianity, which emphasized God the Father's uniqueness and Christ's subordination under the Father, and his opposition to what would become the dominant Christology (Homoousian Christology) made him a primary topic of the First Council of Nicaea convened by Emperor Constantine the Great in 325.
ChristologyIn Christianity, Christology (from the Greek Khristós and -logia), translated from Greek as 'the study of Christ', is a branch of theology that concerns Jesus. Different denominations have different opinions on questions such as whether Jesus was human, divine, or both, and as a messiah what his role would be in the freeing of the Jewish people from foreign rulers or in the prophesied Kingdom of God, and in the salvation from what would otherwise be the consequences of sin.
Eastern OrthodoxyEastern Orthodoxy, otherwise known as Eastern Orthodox Christianity or Byzantine Christianity, is one of the three main branches of Chalcedonian Christianity, alongside Roman Catholicism and Protestantism. Like the Pentarchy of the first millennium, the mainstream (or "canonical") Eastern Orthodox Church is organised into autocephalous churches independent from each other. In the 21st century, the number of mainstream autocephalous churches is seventeen; there also exist autocephalous churches unrecognized by those mainstream ones.
PolytheismPolytheism is the belief in multiple deities, which are usually assembled into a pantheon of gods and goddesses, along with their own religious sects and rituals. Polytheism is a type of theism. Within theism, it contrasts with monotheism, the belief in a singular God who is, in most cases, transcendent. In religions that accept polytheism, the different gods and goddesses may be representations of forces of nature or ancestral principles; they can be viewed either as autonomous or as aspects or emanations of a creator deity or transcendental absolute principle (monistic theologies), which manifests immanently in nature (panentheistic and pantheistic theologies).
Late antiquityLate antiquity was the time of transition from classical antiquity to the Middle Ages, generally spanning the 4th–8th century in Europe and adjacent areas bordering the Mediterranean Basin. The popularization of this periodization in English has generally been credited to historian Peter Brown, after the publication of his seminal work The World of Late Antiquity (1971). Precise boundaries for the period are a continuing matter of debate, but Brown proposes a period between the 3rd and 8th centuries AD.
Council of ChalcedonThe Council of Chalcedon (kælˈsiːdən,_ˈkælsɪdɒn; Concilium Chalcedonense) was the fourth ecumenical council of the Christian Church. It was convoked by the Roman emperor Marcian. The council convened in the city of Chalcedon, Bithynia (modern-day Kadıköy, Istanbul, Turkey) from 8 October to 1 November 451 AD. The council was attended by over 520 bishops or their representatives, making it the largest and best-documented of the first seven ecumenical councils.
Eusebius of NicomediaEusebius of Nicomedia (juːˈsiːbiəs; Εὐσέβιος; died 341) was an Arian priest who baptized Constantine the Great on his deathbed in 337. A fifth-century legend evolved that Pope Sylvester I was the one to baptize Constantine, but this is dismissed by scholars as a forgery 'to amend the historical memory of the Arian baptism that the emperor received at the end of his life, and instead to attribute an unequivocally orthodox baptism to him.' He was a bishop of Berytus (modern-day Beirut) in Phoenicia.
