Question: On which date was this battle of the English Wars of the Roses fought after which William Bonville, 1st Baron Bonville was executed?
Context: Cecily Bonville, 7th Baroness Harington and 2nd Baroness Bonville (c. 30 June 1460 – 12 May 1529) was an English peer, who was also Marchioness of Dorset by her first marriage to Thomas Grey, 1st Marquess of Dorset, and Countess of Wiltshire by her second marriage to Henry Stafford, 1st Earl of Wiltshire. The Smith, later Bromley, later Pauncefote-Bromley, later Bromley-Wilson, later Bromley Baronetcy, of East Stoke in the County of Nottingham, is a title in the Baronetage of Great Britain.  It was created on 31 October 1757 for George Smith, High Sheriff of Nottinghamshire from 1757 to 1759.  He was the eldest son of Abel Smith (1686–1757) and Jane Beaumont (d. 1743) and grandson of Thomas Smith (1631–1699), the founder of the bank in Nottingham.  He was brother of Abel Smith, father of Robert Smith, 1st Baron Carrington, of John Smith, great-grandfather of Vivian Smith, 1st Baron Bicester (see Baron Carrington and Baron Bicester for more information on these branches of the family) and Thomas Smith, grandfather of Julian Pauncefote, 1st Baron Pauncefote.  The first Baronet married Mary, daughter of Major William Howe and his wife Elizabeth, daughter of William Pauncefote.  Major William Howe was the son of Lieutenant-General Emanuel Scrope Howe and his wife Ruperta, daughter of Prince Rupert of the Rhine.  The first Baronet was succeeded by his son, the second Baronet.  He was High Sheriff of Gloucestershire in 1775.  In 1778 he assumed by Royal licence the surname of Bromley in lieu of his patronymic.  In 1803 he assumed by Royal licence the surname of Pauncefote in addition to that of Bromley. The Second Battle of St Albans was a battle of the English Wars of the Roses, fought on 17 February 1461, at St Albans.  The army of the Yorkist faction under the Earl of Warwick attempted to bar the road to London north of the town.  The rival Lancastrian army used a wide outflanking manoeuvre to take Warwick by surprise, cut him off from London, and drive his army from the field.  The victors also released the feeble King Henry VI, who had been Warwick's prisoner, from his captivity.  However, they ultimately failed to take advantage of their victory. William Bonville, 6th Baron Harington (1442 –19 February 1461) was an English nobleman who was a loyal adherent of the House of York during the dynastic conflict in England in the 15th century known as the Wars of the Roses.  He was executed following the Yorkist defeat at the Second Battle of St Albans, leaving his six-month-old daughter, Cecily Bonville heiress to his barony. Baron Revelstoke, of Membland in the County of Devon, is a title in the Peerage of the United Kingdom.  It was created in 1885 for the businessman Edward Baring, head of the family firm of Barings Bank and a member of the Baring family.  Baring was the son of Henry Baring, third son of Sir Francis Baring, 1st Baronet, and the nephew of Alexander Baring, 1st Baron Ashburton, the second cousin of Francis Baring, 1st Baron Northbrook, the elder brother of Evelyn Baring, 1st Earl of Cromer and the uncle of Evelyn Baring, 1st Baron Howick of Glendale.  He was succeeded by his second but eldest surviving son John, the second Baron.  John was a partner in Baring Brothers and Co. Ltd, a Director of the Bank of England, and also served as Lord Lieutenant of Middlesex.  On his death the title passed to his younger brother Cecil, the third Baron.  He acquired Lambay Island, north of Dublin, in 1904.  s of 2013 the title is held by his great-grandson, the seventh Baron, who succeeded his father in 2012.  As a descendant of Sir Francis Baring, 1st Baronet, he is also in remainder to the Baring Baronetcy of Larkbeer, a title held by his kinsman the Baron Northbrook. Nicholas Radford (died 23 October 1455) of Upcott in the parish of Cheriton Fitzpaine, and of Poughill, Devon, was a prominent lawyer in the Westcountry who served as Member of Parliament for Lyme Regis, Dorset (May 1421) and Devon (1435).  During the anarchic times of the Wars of the Roses he was caught up in the dynastic Westcountry rivalry between Thomas de Courtenay, 5th Earl of Devon, of Tiverton Castle, for whom during his minority he had acted as steward, and William Bonville, 1st Baron Bonville, of Shute.  His murder in 1455 by the Earl's faction "ranks among the most notorious crimes of the century", and was the precursor of the Battle of Clyst Heath (1455) fought shortly thereafter near Exeter by the private armies of the two magnates.  He served as a Justice of the Peace for Devon (1424-1455), as Escheator for Devon and Cornwall (1435-6), Recorder of Exeter (1442-1455) and as Tax Collector for Devon in 1450 and as Apprentice-at-law for the Duchy of Lancaster (1439-1455). The title of Baron Bonville was created once in the Peerage of England.  On 23 September 1449, William Bonville was summoned to Parliament.  On his death in 1461, the barony was inherited by his great-granddaughter Cecily Bonville, who two months before succeeded as Baroness Harington, with which title the barony merged until 1554, when both baronies were forfeited.  From her death in 1529 to the forfeiture in 1554, the baronies were merged with the title of Marquess of Dorset. Thomas Courtenay, 5th/13th Earl of Devon (1414–1458) was an English nobleman who was involved in the Wars of the Roses.  His seat was Colcombe Castle, near Colyton, Devon, and later the principal historic family seat of Tiverton Castle after his mother's death.  Much of his life was spent in armed territorial struggle against his near-neighbour in Devon Sir William Bonville of Shute, Devon, at a time when central control over the provinces was weak.  He had been married off as an infant to Margaret Beaufort, granddaughter of John of Gaunt, Duke of Lancaster, and started his career an adherent to the Lancastrian Beaufort party.  On the demise of the Beaufort party he abandoned it in favour of the Duke of York.  When York sought the support of Courtenay's arch-enemy Bonville, Courtenay fell out of favour with York.  The Wars of the Roses led to the deaths and executions of all three of his sons, successively 6th, 7th, and 8th Earls of Devon, and the eventual attainder of his titles and forfeiture of his lands.  The Earldom was however revived in 1485 for his distant cousin Sir Edward Courtenay, KG, (d. 1509), third in descent from his great-uncle.  The ordinal number given to the early Courtenay Earls of Devon depends on whether the earldom is deemed a new creation by the letters patent granted 22 February 1334/5 or whether it is deemed a restitution of the old dignity of the de Redvers family.  Authorities differ in their opinions, and thus alternative ordinal numbers exist, given here. Baron Howick of Glendale, of Howick in the County of Northumberland, is a title in the Peerage of the United Kingdom.  It was created in 1960 for Sir Evelyn Baring, the former Governor of Kenya.  A member of the famous Baring family, he was the third and youngest son of Evelyn Baring, 1st Earl of Cromer, and the great-grandson of Sir Francis Baring, 1st Baronet, the founder of Barings Bank.  Baring's uncle was Edward Baring, 1st Baron Revelstoke, the father of Maurice Baring, while other members of the family include Francis Baring, 1st Baron Northbrook, and Alexander Baring, 1st Baron Ashburton.  s of 2014 the title is held by the first Baron's son, the second Baron, who succeeded in 1973.  As a descendant of the first Earl of Cromer and Sir Francis Baring, 1st Baronet, he is in remainder to both the earldom of Cromer and its subsidiary titles and the Baring baronetcy of Larkbeer, titles held by his kinsmen the Earl of Cromer and the Baron Northbrook respectively. William Bonville, 1st Baron Bonville (c. 1392/3 – 18 February 1461), KG, of Shute, Devon, was an English nobleman, soldier, and administrator.  He was a staunch Yorkist during the Wars of the Roses, and was executed following the Lancastrian victory at the Second Battle of St Albans by order of King Henry VI's Queen Consort, Margaret of Anjou.
Answer: 17 February 1461