Question: Who was the former mistress of Henry VIII of England, who gave birth to Thomas Burgh, 3rd Baron Burgh? 

full_context: Document 1: Henry II of England: Henry II (5 March 1133 – 6 July 1189), also known as Henry Curtmantle (French: "Court-manteau" ), Henry FitzEmpress or Henry Plantagenet, ruled as Count of Anjou, Count of Maine, Duke of Normandy, Duke of Aquitaine, Count of Nantes, King of England and Lord of Ireland; at various times, he also controlled Wales, Scotland and Brittany. Henry was the son of Geoffrey of Anjou and Matilda, daughter of Henry I of England. He became actively involved by the age of 14 in his mother's efforts to claim the throne of England, then occupied by Stephen of Blois, and was made Duke of Normandy at 17. He inherited Anjou in 1151 and shortly afterwards married Eleanor of Aquitaine, whose marriage to Louis VII of France had recently been annulled. Stephen agreed to a peace treaty after Henry's military expedition to England in 1153, and Henry inherited the kingdom on Stephen's death a year later.
Document 2: Thomas Burgh, 1st Baron Burgh: Thomas Burgh, 1st Baron Burgh also spelt "Borough", (c. 1488 – 28 February 1550), 1st Baron Borough of Gainsborough, also "de jure" 5th Baron Strabolgi and 7th Baron Cobham of Sterborough, was an English peer. In 1513 he was knighted on Flodden Field, where he was one of the King's Spears, a bodyguard of King Henry VIII. He was a Member of Parliament in 1529 and later became Lord Chamberlain to Anne Boleyn. He was also one of the twenty-six Peers summoned to the trial of Anne Boleyn in May 1536.
Document 3: Sir Edward Burgh: Sir Edward Burgh (pronounced as Borough) (d. before April 1533) was the eldest son and heir to Sir Thomas Burgh, 1st Baron Burgh and his wife Agnes Tyrwhit. He is known for being the first husband of Catherine Parr, later Queen consort to King Henry VIII. 18th-century historians have mistaken him for his grandfather, the elderly, Sir Edward Burgh, 2nd Baron Burgh of Gainsborough.
Document 4: Henry VIII of England: Henry VIII (28 June 1491 – 28 January 1547) was King of England from 21 April 1509 until his death. Henry was the second Tudor monarch, succeeding his father, Henry VII.
Document 5: Thomas Burgh, 3rd Baron Burgh: Thomas Burgh, 3rd Baron Burgh KG ("c." 1558–14 October 1597) 3rd Baron Borough of Gainsborough, "de jure" 7th Baron Strabolgi and 9th Baron Cobham of Sterborough was the son of William Burgh, 2nd Baron Burgh and Lady Katherine Clinton, daughter of Edward Clinton, 1st Earl of Lincoln and Elizabeth Blount, former mistress of King Henry VIII. He was one of the peers who conducted the trial of the Duke of Norfolk in 1572.
Document 6: Anne Boleyn: ( 1501 – 19 May 1536) was Queen of England from 1533 to 1536 as the second wife of King Henry VIII. Henry's marriage to her, and her subsequent execution by beheading, made her a key figure in the political and religious upheaval that was the start of the English Reformation.
Document 7: Thomas de Courtenay, 5th/13th Earl of Devon: 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.
Document 8: Will of Henry VIII of England: The will of Henry VIII of England was a significant constitutional document, or set of contested documents created in the 1530s and 1540s, and affecting English and Scottish politics for the rest of the 16th century. In conjunction with legislation passed by the English Parliament, it was supposed to have a regulative effect in deciding the succession to the three following monarchs of the House of Tudor, the three legitimate and illegitimate children, (the Third Succession Act expressly recognised the illegitimacy of Henry's daughters) of King Henry VIII of England. Its actual legal and constitutional status was much debated; and arguably the succession to Elizabeth I did not respect Henry's wishes.
Document 9: Thomas de Multon, 1st Baron Multon of Gilsland: Lord Thomas de Moulton (1276–1322) was the first Baron Multon of Gilsland. He married Eleanor de Burgh, daughter of Richard de Burgh 2nd Earl of Ulster; Richard's other daughter, Elizabeth de Burgh, married King Robert the Bruce of Scotland. On 26 August 1307, Thomas de Moulton was summoned to parliament as Baron Moulton of Gilsland, the only creation of that title in the Peerage of England. He was engaged in many of the Scottish wars and subsequently obtained many immunities from the crown in the shape of grants for fairs and markets upon his many manors. He died on 26 November 1313 leaving an only daughter and heiress, Margaret, who inherited the title and estates and was later nicknamed the "Flower of Gillesland". She married Ranulph (Ralph) de Dacre, whom she married because she found him chivalrous. Her father originally opposed the match, but relented when he discovered that the Dacre family was equal to his own in wealth and power, according to the Moulton Annals. Ranulph was later summoned to parliament as Lord Dacre in 1321. The title and estates after Margaret's death in 1361 were inherited by the Dacre family.
Document 10: Henry II of France: Henry II (French: "Henri II" ; 31 March 1519 – 10 July 1559) was a monarch of the House of Valois who ruled as King of France from 31 March 1547 until his death in 1559. The second son of Francis I, he became Dauphin of France upon the death of his elder brother Francis III, Duke of Brittany, in 1536.
Document 11: Catherine Brandon, Duchess of Suffolk: Catherine Brandon, Duchess of Suffolk, "suo jure" 12th Baroness Willoughby de Eresby (22 March 1519 – 19 September 1580), was an English noblewoman living at the courts of King Henry VIII, King Edward VI and Queen Elizabeth I. She was the fourth wife of Charles Brandon, 1st Duke of Suffolk, who acted as her legal guardian during his third marriage to Henry VIII's sister Mary. Her second husband was Richard Bertie, a member of her household. Following Charles Brandon's death in 1545, it was rumoured that King Henry had considered marrying Catherine as his seventh wife, while he was still married to his sixth wife, Catherine Parr, who was Catherine's close friend.
Document 12: Henry V of England: Henry V (9 August 1386 – 31 August 1422) was King of England from 1413 until his death at the age of 36 in 1422. He was the second English monarch who came from the House of Lancaster.
Document 13: Edward VI of England: Edward VI (12 October 1537 – 6 July 1553) was King of England and Ireland from 28 January 1547 until his death. He was crowned on 20 February at the age of nine. The son of Henry VIII and Jane Seymour, Edward was England's first monarch to be raised as a Protestant. During his reign, the realm was governed by a Regency Council because he never reached his majority. The Council was first led by his uncle Edward Seymour, 1st Duke of Somerset (1547–1549), and then by John Dudley, 1st Earl of Warwick, from 1551 Duke of Northumberland.
Document 14: William Howard, 1st Baron Howard of Effingham: William Howard, 1st Baron Howard of Effingham (c. 1510 – 12 January 1573), was the son of Thomas Howard, 2nd Duke of Norfolk and Agnes Tilney. He served four monarchs, Henry VIII, Edward VI, Mary I and Elizabeth I, in various official capacities, most notably on diplomatic missions and as Lord Admiral and Lord Chamberlain of the Household.
Document 15: Henry VIII (play): Henry VIII is a collaborative history play, written by William Shakespeare and John Fletcher, based on the life of King Henry VIII of England. An alternative title, All Is True, is recorded in contemporary documents, the title Henry VIII not appearing until the play's publication in the First Folio of 1623. Stylistic evidence indicates that individual scenes were written by either Shakespeare or his collaborator and successor, John Fletcher. It is also somewhat characteristic of the late romances in its structure. It is noted for having more stage directions than any of Shakespeare's other plays.
ground_truth: Elizabeth Blount