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

Context articles: Sir Edward Burgh
Baron Burgh
Henry FitzRoy, 1st Duke of Richmond and Somerset
Henry Vassall-Fox, 3rd Baron Holland
Marguerittes
Henry VIII of England
Thomas Burgh, 3rd Baron Burgh
Edward Cromwell, 3rd Baron Cromwell
Thomas Burgh, 1st Baron Burgh
William Paget, 4th Baron Paget

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.
Baron Burgh is a title that has been created twice in the Peerage of England.
 The first creation was for William de Burgh in 1327.
Henry FitzRoy, 1st Duke of Richmond and Somerset (15 June 1519 – 23 July 1536), was the son of King Henry VIII of England and his mistress, Elizabeth Blount, and the only illegitimate offspring whom Henry VIII acknowledged.
 He was the younger half-brother of Queen Mary I, as well as the older half-brother of Queen Elizabeth I and King Edward VI.
 Through his mother he was the elder half-brother of the 4th Baroness Tailboys of Kyme and of the 2nd and 3rd Baron Tailboys of Kyme.
Henry Richard Vassall-Fox, 3rd Baron Holland, of Holland, and 3rd Baron Holland, of Foxley PC (21 November 1773 – 22 October 1840) was an English politician and a major figure in Whig politics in the early 19th century.
 A grandson of Henry Fox, 1st Baron Holland, and nephew of Charles James Fox, he served as Lord Privy Seal between 1806 and 1807 in the Ministry of All the Talents headed by Lord Grenville and as Chancellor of the Duchy of Lancaster between 1830 and 1834 and again between 1835 and his death in 1840 in the Whig administrations of Lord Grey and Lord Melbourne.
Marguerittes is a commune in the Gard department in southern France.
 In 1717, Antoine de Teissier (b.1667) was created the 1st Baron de Margeurittes.
 One of his sons was a Huguenot who took refuge in Switzerland and his grandson, Jean Antoine de Teissier, 3rd Baron of Marguerittes, was guillotined 20 May 1794.
 The 3rd Baron's son settled in England at Woodcote Park and was created Baron de Teissier by Louis XVIII in recognition of his father's sacrifices to France.
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.
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.
Edward Cromwell, 3rd Baron Cromwell (c. 1560 – 27 April 1607) was an English peer.
 He was the son of Henry Cromwell, 2nd Baron Cromwell by his wife Mary, daughter of John Paulet, 2nd Marquess of Winchester and his first wife Elizabeth Willoughby.
 His grandfather, Gregory, son of Thomas Cromwell, chief minister to Henry VIII, was created Baron Cromwell on 18 December 1540.
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.
William Paget, 4th Baron Paget of Beaudesert (1572 – 29 August 1629) was an English peer and colonist born in Beaudesert House, Staffordshire, England to Thomas Paget, 3rd Baron Paget and Nazareth Newton.
 He was a descendent of William Paget, 1st Baron Paget.
 William's father had been stripped of his title after fleeing to Spain, as a result of his Catholicism.
 England had recently become a Protestant state when Henry VIII had separated the Church of England and placed himself at its head.
 Europe was ablaze with conflicts between Catholics and Protestants.
 England's "old enemy", France, was in the midst of its Religious Wars, which saw the St. Bartholomew's Day massacre in the year in which William was born.