Question: The person who was king of England when William de Botreaux, 1st Baron Botreaux died was born on what date?

William de Botreaux (1337–1391) (pronounced "But'ry") (alt.  “Bottreaux, Boterel etc.) was a prominent English West-Country baron during the reigns of King Edward III (1327-1377) and King Richard II (1377-1399). <SEP> Hall in the parish of Lanteglos-by-Fowey in Cornwall, England, is an historic estate, most prominent as the seat of a branch of the Mohun family, feudal barons of Dunster, of Dunster Castle in Somerset, of whom the first member, the warrior William de Moyon (died post 1090), had come over with William the Conqueror during the Norman Conquest of 1066.  The family of Mohun of Hall was also seated at Bodinnick ("alias" Bodinnoc, etc.) also in the parish of Lanteglos-by-Fowey and later at Boconnoc, both in Cornwall, and was one of the four co-heirs of Edward Courtenay, 1st Earl of Devon (1527–1556), feudal baron of Okehampton, etc., of Tiverton Castle, Okehampton Castle, etc., the last of the mediaeval Courtenay Earls of Devon.  In recognition of this in 1628 the senior representative of the Mohun family of Hall was created Baron Mohun of Okehampton, namely John Mohun, 1st Baron Mohun of Okehampton (1595-1641) eldest son and heir of Sir Reginald Mohun, 1st Baronet (1564–1639) of Boconnoc.  The family of Mohun of Hall died out in the male line in 1712, following the death by duel of Charles Mohun, 4th Baron Mohun of Okehampton (1677-1712), who died without progeny.  However, the family had long out-lived the senior Dunster line which died out in the male line in 1375, following the death of John de Mohun, 2nd Baron Mohun, KG, (c.1320-1375).  Two monumental brasses survive in Lanteglos church to members of the Mohun family of Hall, namely Thomas Mohun (died c.1440) and John Mohun (d.1508). <SEP> Baron Ferrers of Groby (or Baron Ferrers de Groby) was a title in the Peerage of England.  It was created by writ on 29 December 1299 when William Ferrers, 1st Baron Ferrers of Groby was summoned to parliament.  He was the son of Sir William de Ferrers, Knt., of Groby, Leicestershire, (d.1287) by his first wife Anne Durward, 2nd daughter of Alan Durward and his wife Margery of Scotland, and grandson of William de Ferrers, 5th Earl of Derby.  The first Baron was married to Ellen de Menteith, daughter of Alexander, Earl of Menteith.  In 1475 the eighth baron was created the Marquess of Dorset, and the barony in effect merged with the marquessate.  It was forfeited along with the marquessate when the third marquess was attainted in 1554. <SEP>  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. 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.  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.