Question: Bishop of the Isles traces its origins to the bishop who became an adventurer after which year?

full_context: Document 1: William of Baskerville: William of Baskerville (Italian: "Guglielmo da Baskerville") is a fictional Franciscan friar from the 1980 historical mystery novel "Il nome della rosa" ("The Name of the Rose") by Umberto Eco, which is itself a recounting of events as experienced by Adso of Melk, a Francisian novice with whom William travels. Years earlier, as an inquisitor, Brother William presided at some trials in England and Italy, where he distinguished himself by his perspicacity along with great humility.<br> Following the events of "The Name of the Rose", Adso and William part ways, with Adso relating the tale before his death. We are informed near the end of the book that William had earlier died during a Plague in Europe.
Document 2: Bishop of Galloway: The Bishop of Galloway, also called the Bishop of Whithorn, was the eccesiastical head of the Diocese of Galloway, said to have been founded by Saint Ninian in the mid-5th century. The subsequent Anglo-Saxon bishopric was founded in the late 7th century or early 8th century, and the first known bishop was one Pehthelm, "shield of the Picts". According to Anglo-Saxon ecclesiastical tradition, the bishopric was founded by Saint Ninian, a later corruption of the British name Uinniau or Irish Finian; although there is no contemporary evidence, it is quite likely that there had been a British or Hiberno-British bishopric before the Anglo-Saxon takeover. After Heathored (fl. 833), no bishop is known until the apparent resurrection of the diocese in the reign of King Fergus of Galloway. The bishops remained, uniquely for Scottish bishops, the suffragans of the Archbishop of York until 1359 when the pope released the bishopric from requiring metropolitan assent. James I formalised the admission of the diocese into the Scottish church on 26 August 1430 and just as all Scottish sees, Whithorn was to be accountable directly to the pope. The diocese was placed under the metropolitan jurisdiction of St Andrews on 17 August 1472 and then moved to the province of Glasgow on 9 January 1492. The diocese disappeared during the Scottish Reformation, but was recreated by the Catholic Church in 1878 with its cathedra at Dumfries, although it is now based at Ayr.
Document 3: William of Malmesbury: William of Malmesbury (Latin: "Willelmus Malmesbiriensis" ; c. 1095 – c. 1143 ) was the foremost English historian of the 12th century. He has been ranked among the most talented English historians since Bede. Modern historian C. Warren Hollister described him as "a gifted historical scholar and an omnivorous reader, impressively well versed in the literature of classical, patristic and earlier medieval times as well as in the writings of his own contemporaries. Indeed William may well have been the most learned man in twelfth-century Western Europe."
Document 4: Willibrord: Willibrord (Latin: "Villibrordus" ; 658 – 7 November AD 739) was a Northumbrian missionary saint, known as the "Apostle to the Frisians" in the modern Netherlands. He became the first Bishop of Utrecht and died at Echternach, Luxembourg.
Document 5: Scotland: Scotland ( ; Scots: ] ; Scottish Gaelic: "Alba" ] ) is a country that is part of the United Kingdom and covers the northern third of the island of Great Britain. It shares a border with England to the south, and is otherwise surrounded by the Atlantic Ocean, with the North Sea to the east and the North Channel and Irish Sea to the south-west. In addition to the mainland, the country is made up of more than 790 islands, including the Northern Isles and the Hebrides.
Document 6: Roolwer: Roolwer was an eleventh-century ecclesiast. He is the first named bishop of a jurisdiction which later became the Diocese of the Isles, and appears to have served at his post before, and perhaps during, the reign of Gofraid Crobán, King of Dublin and the Isles. Roolwer's name appears to correspond to the Old Norse "Hrólfr", which could mean that he is identical to either of two contemporary like-named bishops of Orkney. Roolwer's predecessor in the Isles may have been Dúnán, whose death in 1074 during the Dublin overlordship of Toirdelbach Ua Briain, King of Munster, may have enabled the ecclesiastical separation of Dublin from the Isles. The site of Roolwer's cathedral is unknown, although Maughold and St Patrick's Isle are possibilities.
Document 7: Wimund: Wimund was a bishop who became a seafaring warlord adventurer in the years after 1147. His story is passed down to us by 12th-century English historian William of Newburgh in his "Historia rerum anglicarum", Book I, Chapter 24 entitled "Of bishop Wimund, his life unbecoming a bishop, and how he was deprived of his sight".
Document 8: William I de La Marck: William de la Marck (1446–1485) was an adventurer of German extraction. He became an important character in the late 15th century in the Prince-Bishopric of Liège. William's was nicknamed "Le Sanglier des Ardennes" (The Wild Boar of the Ardennes)— because he was as fierce as the wild boar which he delighted to hunt.
Document 9: Bishop of Ramsbury (ancient): The Bishop of Ramsbury was an episcopal title used by medieval English-Catholic diocesan bishops in the Anglo-Saxon English church. The title takes its name from the village of Ramsbury in Wiltshire, and was first used between the 10th and 11th centuries by the Anglo-Saxon Bishops of Ramsbury. In Saxon times, Ramsbury was an important location for the Church, and several of the early bishops went on to become Archbishops of Canterbury.
Document 10: Bishop of the Isles: The Bishop of the Isles or Bishop of Sodor was the ecclesiastical head of the Diocese of Sodor, one of Scotland's thirteen medieval bishoprics. The bishopric, encompassing both the Hebrides and Mann, probably traces its origins as an ecclesiastical unity to the careers of Olaf, King of the Isles, and Bishop Wimund. Previously, there had been numerous bishoprics, and recorded bishoprics include Kingarth, Iona, Skye and Mann. There were very likely numerous others.
Document 11: Henry of Lund: Henry was an 11th-century bishop and Christian missionary. He was probably the keeper of the treasury of King Canute the Great in England. Sometime before the year 1035, according to Adam of Bremen, Henry went to Orkney as bishop. As Bishop of Orkney, he was probably more of a missionary bishop, and may have been under the metropolitan authority of the Archbishop of York. He is possibly the Henry who went to Iceland for two undatable years. In 1060/1, the King of Denmark, Sweyn II, appointed him Bishop of Lund. He is the first man known to have held the bishopric of Lund, as well as Orkney. He is said to have died from an alcoholic episode sometime in the mid-1060s.
Document 12: Thirteen Treasures of the Island of Britain: The Thirteen Treasures of the Island of Britain (Welsh: "Tri Thlws ar Ddeg Ynys Prydain") are a series of items in late medieval Welsh tradition. Lists of the items appear in texts dating to the 15th and 16th centuries. Most of the items are placed in the "Hen Ogledd" or "Old North", the Brittonic-speaking parts of what is now southern Scotland and Northern England; some early manuscripts refer to the whole list specifically as treasures "that were in the North". The number of treasures is always given as thirteen, but some later versions list different items, replacing or combining entries to maintain the number. Later versions also supplement the plain list with explanatory comments about each treasure.
Document 13: Azor (landowner): Azor was one of the most powerful English landowners at the time of Edward the Confessor in the 11th century. He was a kinsman and chamberlain of Brihtheah, a bishop of Worcester and a former abbot of Pershore. He owned property from Lincolnshire down to the Isle of Wight in many counties and like another great landowner of the times, Toki, he also owned urban property in addition to his vast possession of lavish country estates. He is mentioned in the Domesday Book and appears in countless histories of English counties along with his sons,
Document 14: Fothad I: Fothad I († 963) is the second alleged Bishop of the Scots (906x955). We know he had the status of "bishop" during the reign of King Dub mac Maíl Coluim because the "Chronicle of the Kings of Alba" has his death in the period of his reign (962-967). Such a date is supported by the Irish annals, and according to the "Annals of the Four Masters", he died in 963. According to the latter source, he was "Fothadh, mac Brain, scribhnidh & espucc Insi Alban"; that is, "Fothad, son of Bran, scribe and bishop of the islands of Scotland". This entry taken on its own obviously places some doubt on his status as a bishop of St Andrews. It is only because he is mentioned as a bishop of St. Andrews in the bishop-lists of Walter Bower and Andrew of Wyntoun that he is identified with this see; however no pre-15th century sources actually confirm this, although it is true that there was definitely a bishop of this name in the 11th century. Bower, however, gives some explanation, telling us that Fothad "was driven out by King Indolff; and after his expulsion from the see he lived for 8 years". This Indolff, or King Idulb mac Causantín reigned between 954 and 962. If we take both Bower's statement and the obit reported in the "Annals of the Four Masters" to be correct, this means that Fothad was expelled in 955. Although it is unlikely anyway, he could not have been bishop before the year 906, when we know his predecessor Cellach was still bishop. That he died in 963 as "espucc Insi Alban" allows the possibility that he transferred his see to Iona or somewhere else on the western coast of Scotland after 955, although this is just conjecture.
Document 15: History of popular religion in Scotland: The history of popular religion in Scotland includes all forms of religion outwith the formal theology and structures of institutional religion, between the earliest times of human occupation of what is now Scotland and the present day. Very little is known about religion in Scotland before the arrival of Christianity. It is generally presumed to have resembled Celtic polytheism and there is evidence of the worship of spirits and wells. The Christianisation of Scotland was carried out by Irish-Scots missionaries, and to a lesser extent those from Rome and England, from the sixth century. Elements of paganism survived into the Christian era. Most early evidence of religious practice is heavily biased towards monastic life. Priests carried out baptisms, masses and burials, prayed for the dead and offered sermons. The church dictated in moral and legal matters and impinged on other elements of everyday life through its rules on fasting, diet, the slaughter of animals and rules on purity and ritual cleansing. One of the main features of Medieval Scotland was the Cult of Saints, with shrines devoted to local and national figures, including St Andrew, and the establishment of pilgrimage routes. Scots also played a major role in the Crusades. Historians have discerned a decline of monastic life in the late medieval period. In contrast, the burghs saw the flourishing of mendicant orders of friars in the later fifteenth century. As the doctrine of Purgatory gained importance the number of chapelries, priests and masses for the dead within parish churches grew rapidly. New "international" cults of devotion connected with Jesus and the Virgin Mary began to reach Scotland in the fifteenth century. Heresy, in the form of Lollardry, began to reach Scotland from England and Bohemia in the early fifteenth century, but did not achieve a significant following.
ground_truth: 1147