Fagan (Latin: "Faganus" ; Welsh: "Ffagan" ), also known by other names including Fugatius, was a possibly legendary 2nd-century bishop and saint, said to have been sent by the pope to answer King Lucius's request for baptism and conversion to Christianity.
 Together with his companion St Deruvian, he was sometimes reckoned as the apostle of Britain.
 King Lucius's letter (in most accounts, to Pope Eleutherius) may represent earlier traditions but does not appear in surviving sources before the 6th century; the names of the bishops sent to him does not appear in sources older than the early 12th century, when their story was used to support the independence of the bishops of St Davids in Wales and the antiquity of the abbey at Glastonbury in England.
 The story became widely known following its appearance in Geoffrey of Monmouth's pseudohistorical "History of the Kings of Britain".
 This was influential for centuries and its account of SS Fagan and Deruvian were used during the English Reformation to support the claims of both the Catholics and Protestants.
 Geoffrey's account is now considered wholly implausible, but Christianity was well-established in Roman Britain by the third century.
 Some scholars therefore argue the stories preserve a more modest account of the conversion of a Romano-British chieftain, possibly by Roman emissaries by these names.
Vikings (Old English: "wicing"—"pirate", Danish and Bokmål: "vikinger" ; Swedish and Nynorsk: "vikingar" ; Icelandic: "víkingar" , from Old Norse "víkingar "), were Norse seafarers, mainly speaking the Old Norse language, who raided and traded from their Northern European homelands across wide areas of northern, central and eastern Europe, during the late 8th to late 11th centuries.
 The term is also commonly extended in modern English and other vernaculars to the inhabitants of Viking home communities during what has become known as the Viking Age.
 This period of Nordic military, mercantile and demographic expansion constitutes an important element in the early medieval history of Scandinavia, Estonia, the British Isles, France, Kievan Rus' and Sicily.
In Germanic paganism, a vé (Old Norse) or wēoh (Old English) is a type of shrine or sacred enclosure.
 The term appears in skaldic poetry and in place names in Scandinavia (with the exception of Iceland), often in connection with a Norse pagan deity or a geographic feature.
 The name of the Norse god Vé refers to the practice.
 Andy Orchard says that a vé may have surrounded a temple or have been simply a marked, open place where worship occurred.
 Orchard points out that Tacitus, in his 1st century CE work "Germania", says that the Germanic peoples, unlike the Romans, "did not seek to contain their deities within temple walls."
Christianity in Madagascar is practiced by just under half the population of the island, often in syncretic form with traditional religious practices.
 Protestantism was introduced by the first envoys of the London Missionary Society in 1818, who proselytized and taught literacy through a Malagasy language Bible at the public schools they established in the highlands at the request of King Radama I.
 The number of converts remained low but gradually grew under repression during the reign of his successor, Queen Ranavalona I, and the more permissive religious policies of her son, Radama II, and his widow, Queen Rasoherina.
 The spread of Protestantism among the Merina upper classes by the mid-1800s, including Queen Ranavalona II, coupled with the growing political influence of the British missionaries, led then-Prime Minister Rainilaiarivony to legislate the conversion of the royal court.
 This prompted widespread popular conversion to Protestantism throughout the highlands in the late 1800s.
Norwegian literature is literature composed in Norway or by Norwegian people.
 The history of Norwegian literature starts with the pagan Eddaic poems and skaldic verse of the 9th and 10th centuries with poets such as Bragi Boddason and Eyvindr Skáldaspillir.
 The arrival of Christianity around the year 1000 brought Norway into contact with European medieval learning, hagiography and history writing.
 Merged with native oral tradition and Icelandic influence, this was to flower into an active period of literature production in the late 12th and early 13th centuries.
 Major works of that period include "Historia Norwegie", "Thidreks saga" and "Konungs skuggsjá."
The Christianization of Scandinavia took place between the 8th and the 12th centuries.
 The realms of Scandinavia proper, Denmark, Norway and Sweden, established their own Archdioceses, responsible directly to the Pope, in 1104, 1154 and 1164, respectively.
 The conversion to Christianity of the Scandinavian people required more time, since it took additional efforts to establish a network of churches.
 The Sami remained unconverted until the 18th century.
Norse pagan worship is the traditional religious rituals practiced by Norse pagans in Scandinavia in pre-Christian times.
 Norse paganism was a folk religion (as opposed to an organised religion), and its main purpose was the survival and regeneration of society.
 Therefore, the faith was decentralized and tied to the village and the family, although evidence exists of great national religious festivals.
 The leaders managed the faith on behalf of society; on a local level, the leader would have been the head of the family, and nationwide, the leader was the king.
 Pre-Christian Scandinavians had no word for religion in a modern sense.
 The closest counterpart is the word "sidr", meaning custom.
 This meant that Christianity, during the conversion period, was referred to as "nýr sidr" (the new custom) while paganism was called "forn sidr" (ancient custom).
 The centre of gravity of pre-Christian religion lay in religious practice — sacred acts, rituals and worship of the gods.
The Great Apostasy is a term used by some religious groups to describe the perceived fallen state of traditional Christianity, especially the Roman Catholic Church, because they claim it allowed traditional Greco-Roman culture (i.e.Greco-Roman mysteries, deities of solar monism such as Mithras and Sol Invictus, pagan festivals and Mithraic sun worship and idol worship) into the church.
 That it is not representative of the faith founded by Jesus and promulgated through his twelve Apostles: in short, in their opinion, the church has fallen into apostasy.
 They feel that to attract the pagans to nominal Christianity, the Catholic Church took measures to amalgamate the Christian and pagan festivals so pagans would join the church; for example, bringing in the pagan festival of Easter as a substitute for the Pasch or Passover, although neither Jesus nor his Apostles enjoined the keeping of this or any other festival.
Mormonism and Christianity have a complex theological, historical, and sociological relationship.
 Mormons express the doctrines of Mormonism using standard biblical terminology, and have similar views about the nature of Jesus' atonement, bodily resurrection, and Second Coming as traditional Christianity.
 Nevertheless, most Mormons do not accept the Trinitarian views of orthodox Nicene Christianity, codified in the Nicene and Nicene-Constantinopolitan Creeds of 325 and 381.
 Though Mormons consider the Bible as scripture, they do not believe in biblical inerrancy.
 They have also adopted additional scriptures, including the Book of Mormon, the Doctrine and Covenants, and the Pearl of Great Price.
 Mormons practice baptism and celebrate the Eucharist, but they also participate in religious rituals not practiced by traditional Christianity.
Deruvian (Medieval Latin: "Deruvianus" ), also known by several other names including Damian, was a possibly legendary 2nd-century bishop and saint, said to have been sent by the pope to answer King Lucius's request for baptism and conversion to Christianity.
 Together with his companion St Fagan, he was sometimes reckoned as the apostle of Britain.
 King Lucius's letter (in most accounts, to Pope Eleutherius) may represent earlier traditions but does not appear in surviving sources before the 6th century; the names of the bishops sent to him does not appear in sources older than the early 12th century, when their story was used to support the independence of the bishops of St Davids in Wales and the antiquity of the Glastonbury Abbey in England.
 The story became widely known following its appearance in Geoffrey of Monmouth's pseudohistorical "History of the Kings of Britain".
 This was influential for centuries and its account of SS Fagan and Deruvian was used during the English Reformation to support the claims of both the Catholics and Protestants.
 Geoffrey's account is now considered wholly implausible, but Christianity was well-established in Roman Britain by the third century.
 Some scholars therefore argue the stories preserve a more modest account of the conversion of a Romano-British chieftain, possibly by Roman emissaries by these names.

Question: Norse pagan worship is the traditional religious rituals practiced by Norse pagans in Scandinavia in pre-Christian times, Christianity, during the conversion period, was referred to as "nýr sidr" (the new custom), the conversion period is speaking in regards to which titled event, that took place between the 8th and the 12th centuries, and the realms of Scandinavia proper, Denmark, Norway and Sweden, established their own Archdioceses, responsible directly to the Pope?
Answer: Christianization of Scandinavia