Question: Who was the mother of the man who was King of England from 1483 to 1485?

full_context: Document 1: Richard II of England: Richard II (6 January 1367 – c. 14 February 1400), also known as Richard of Bordeaux, was King of England from 1377 until he was deposed on 30 September 1399. Richard, a son of Edward, the Black Prince, was born in Bordeaux during the reign of his grandfather, Edward III. His father was Prince of Aquitaine. Richard was the younger brother of Edward of Angoulême, upon whose death Richard, at three years of age, became second in line to the throne after his father. Upon the death of Richard's father prior to the death of Edward III, Richard, by primogeniture, became the heir apparent to the throne. With Edward III's death the following year, Richard succeeded to the throne at the age of ten.
Document 2: Caerlaverock Castle: Caerlaverock Castle (from "caer laverock", "lark castle") is a moated triangular castle first built in the 13th century. It is located on the southern coast of Scotland, 11 km south of Dumfries, on the edge of the Caerlaverock National Nature Reserve. Caerlaverock was a stronghold of the Maxwell family from the 13th century until the 17th century when the castle was abandoned. It was besieged by the English during the Wars of Scottish Independence, and underwent several partial demolitions and reconstructions over the 14th and 15th centuries. In the 17th century, the Maxwells were created Earls of Nithsdale, and built a new lodging within the walls, described as among "the most ambitious early classical domestic architecture in Scotland". In 1640 the castle was besieged for the last time and was subsequently abandoned. Although demolished and rebuilt several times, the castle retains the distinctive triangular plan first laid out in the 13th century. Caerlaverock Castle was built to control trade in early times.
Document 3: Richard III of England: Richard III (2 October 1452 – 22 August 1485) was King of England from 1483 until his death in 1485, at the age of 32, in the Battle of Bosworth Field. He was the last king of the House of York and the last of the Plantagenet dynasty. His defeat at Bosworth Field, the last decisive battle of the Wars of the Roses, marked the end of the Middle Ages in England. He is the subject of the historical play "Richard III" by William Shakespeare.
Document 4: Richard III (play): Richard III is a historical play by William Shakespeare believed to have been written in approximately 1592. It depicts the Machiavellian rise to power and subsequent short reign of King Richard III of England. The play is grouped among the histories in the First Folio and is most often classified as such. Occasionally, however, as in the quarto edition, it is termed a tragedy. "Richard III" concludes Shakespeare's first tetralogy (also containing "Henry VI" parts 1–3).
Document 5: Neville–Neville feud: The Neville–Neville feud was an inheritance dispute which took place in the North of England during the early fifteenth century between two branches of the Neville family. After the death of Ralph Neville, 1st Earl of Westmorland in 1425, the feud continued through the 1430s, until 1443. It was caused by the transfer of lands and titles to the earl of Westmorland's second wife, Joan Beaufort, and her children. Many of the Neville family holdings were transferred through legal means to Joan's eldest son Richard Neville, 5th Earl of Salisbury, in effect disinheriting Westmorland's issue from his first wife. The title earl of Westmorland passed to the issue of Ralph's first marriage for legal reasons, but many holdings, particularly those of the Neville patrimony in Yorkshire and Raby Castle in Durham were transferred to Joan and her children. The Nevilles had many estates, but their main residence seems to have been Raby Castle. The House of Beaufort was able to consolidate their control over the County Palatine of Durham when Joan's youngest son, Robert Neville, assumed office as Bishop of Durham in 1437.
Document 6: White boar: The White Boar was the personal device or badge of the English King Richard III of England (1452—1485, reigned from 1483), and is an early instance of the use of boars in heraldry.
Document 7: Loch Leven Castle: Loch Leven Castle is a ruined castle on an island in Loch Leven, in the Perth and Kinross local authority area of Scotland. Possibly built around 1300, the castle was the location of military action during the Wars of Scottish Independence (1296–1357). In the latter part of the 14th century, the castle was granted by his uncle to William Douglas, 1st Earl of Douglas, and remained in Douglas' hands for the next 300 years. Mary, Queen of Scots was imprisoned here in 1567–1568, and forced to abdicate as queen, before escaping with the help of her gaoler's family. In 1588, the Queen's gaoler inherited the title Earl of Morton, and moved away from the castle. It was bought, in 1675, by Sir William Bruce, who used the castle as a focal point in his garden; it was never again used as a residence.
Document 8: Clare Castle: Clare Castle is a medieval castle in the small town of Clare in Suffolk, England. Built shortly after the Norman conquest of England by Richard Fitz Gilbert, the motte and bailey castle was later improved in stone. In the 14th century the castle was the home of Elizabeth de Clare, one of the richest women in England, who maintained a substantial household there. The castle passed into the hands of the Crown, and by the 16th century was in ruins. Damaged by the construction of the Great Eastern Railway through the castle in 1867, the remains of the castle are now part of a local park and a scheduled monument and a grade 2* listed building.
Document 9: Castle Ashby: Castle Ashby is the name of a civil parish, an estate village and an English country house in rural Northamptonshire. Historically the village was set up to service the needs of Castle Ashby House, the seat of the Marquess of Northampton. The village has one small pub-hotel, The Falcon. At the time of the 2011 census, the parish's population (including Chadstone) was 111 people. The village contains many houses rebuilt from the 1860s onwards. These include work by the architect E.F. Law of Northampton, whose work can also be seen nearby at Horton Church. The castle is the result of a licence obtained in 1306, for Walter Langton, Bishop of Coventry, to castellate his mansion in the village of Ashby.
Document 10: Richard III (1995 film): Richard III is a 1995 British drama film adapted from William Shakespeare's play of the same name, starring Ian McKellen, Annette Bening, Jim Broadbent, Robert Downey Jr., Nigel Hawthorne, Kristin Scott Thomas, Maggie Smith, John Wood, and Dominic West. The film sets the play in a fictional fascist version of 1930s Britain.
Document 11: Raby Castle: Raby Castle (grid reference [ NZ12912177] ) is near Staindrop in County Durham, England, among 200 acre of deer park. It was built by John Neville, 3rd Baron Neville de Raby, between approximately 1367 and 1390. Cecily Neville, the mother of the Kings Edward IV and Richard III, was born here. After Charles Neville, 6th Earl of Westmorland, led the failed Rising of the North in favour of Mary, Queen of Scots in 1569 Raby Castle was taken into royal custody.
Document 12: Thirlestane Castle: Thirlestane Castle is a castle set in extensive parklands near Lauder in the Borders of Scotland. The site is aptly named Castle Hill, as it stands upon raised ground. However, the raised land is within Lauderdale, the valley of the Leader Water. The land has been in the ownership of the Maitland family since 1587, and Thirlestane served as the seat of the Earls of Lauderdale. The castle was substantially extended in the 1670s by the first and only Duke of Lauderdale. Further additions were made in the 19th century. The castle is now cared for by a charitable trust, and is open to the public.
Document 13: Ricardian (Richard III): Ricardians are people interested in altering the posthumous reputation of Richard III, King of England (reigned 1483–1485). Richard III has long been portrayed unfavourably, most notably in William Shakespeare's play "Richard III", in which Richard is portrayed as having murdered his nephew, the crown prince of England, a 12 year old child at the time, in order to secure the English throne for himself. Ricardians have worked in an effort to turn this around and to paint this portrayal, and the many other related assertions that followed, as most probably false politically motivated accusations.
Document 14: Richard III (disambiguation): Richard III (1452–1485) King of England from 26 June 1483 until his death on 22 August 1485.
Document 15: Edzell Castle: Edzell Castle is a ruined 16th-century castle, with an early-17th-century walled garden. It is located close to Edzell, and is around 5 mi north of Brechin, in Angus, Scotland. Edzell Castle was begun around 1520 by David Lindsay, 9th Earl of Crawford, and expanded by his son, Sir David Lindsay, Lord Edzell, who also laid out the garden in 1604. The castle saw little military action, and was, in its design, construction and use, more of a country house than a defensive structure. It was briefly occupied by English troops during Oliver Cromwell's invasion of Scotland in 1651. In 1715 it was sold by the Lindsay family, and eventually came into the ownership of the Earl of Dalhousie. It was given into state care in the 1930s, and is now a visitor attraction run by Historic Scotland (open all year; entrance charge). The castle consists of the original tower house and building ranges around a courtyard. The adjacent Renaissance walled garden, incorporating intricate relief carvings, is unique in Scotland. It was replanted in the 1930s, and is considered to have links to esoteric traditions, including Rosicrucianism and Freemasonry.
ground_truth: Cecily Neville