Question:  Anthony Charles FitzClarence was the last of the senior male line that began with the third son of George III and younger brother and successor to who?

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Prince Richard, Duke of Gloucester: Prince Richard, Duke of Gloucester, {'1': ", '2': ", '3': ", '4': "} (Richard Alexander Walter George; born 26 August 1944) is the youngest grandchild of King George V and Queen Mary.  He practised as an architect until the death of his elder brother placed him in direct line to inherit his father's dukedom of Gloucester, which he inherited, as the second duke, in 1974.  He is currently 24th in the line of succession to the British throne.  He is also the senior male line descendant of three British monarchs: Victoria, Edward VII and George V .

Sir George Grey, 1st Baronet: Sir George Grey, 1st Baronet, {'1': ", '2': ", '3': ", '4': "} (10 October 1767 – 3 October 1828) was a British Royal Navy officer.  He was born at the family home of Fallodon, Northumberland on 10 October 1767, the third son of Charles Grey, 1st Earl Grey (1729–1807) and Elizabeth Grey (1744–1822), and younger brother of Charles Grey, 2nd Earl Grey and General Sir Henry George Grey.  He served as a naval officer in the Royal Navy from the age of 14, and was on active service from 1781 to 1804, during the latter years of the American war of Independence, during the French Revolutionary War and the first year of the Napoleonic War.  He served as Flag Captain for John Jervis, Earl of St Vincent and later as Master and Commander of the Mediterranean Fleet.  He also served as Flag Captain for King George III on his royal yacht.  From 1804 to 1806, he was Commissioner at Sheerness Dockyard, and from 1806 until his death on 3 October 1828 he was Commissioner at Portsmouth Dockyard

Blunt baronets: The Blunt Baronetcy, of the City of London, is a title in the Baronetage of Great Britain.  It was created on 17 June 1720 for John Blunt.  He was a director of the South Sea Company.  His great-grandson, the fourth Baronet, represented Lewes in the House of Commons from 1831 to 1840.  His line of the family failed on the death of his son, the fifth Baronet, in 1847.  The late Baronet was succeeded by his first cousin, the sixth Baronet.  He was the son of Richard Charles Blunt, second son of the third Baronet.  He died unmarried and was succeeded by his first cousin, the seventh Baronet.  He was the son of William Blunt, third son of the third Baronet.  He died childless and was succeeded by his younger brother, the eighth Baronet.  He fought in the Indian Rebellion of 1857.  The baronetcy descended in the direct line until the death of his grandson, the tenth Baronet, in 1969.  He was succeeded by his younger brother, the eleventh Baronet.  As of 2007 the title is held by the latter's son, the twelfth Baronet, who succeeded in 1975.

House of York: The House of York was a cadet branch of the English royal House of Plantagenet.  Three of its members became Kings of England in the late 15th century.  The House of York was descended in the male line from Edmund of Langley, 1st Duke of York, the fourth surviving son of Edward III, but also represented Edward's senior line, being cognatic descendants of Lionel, Duke of Clarence, Edward III's second surviving son.  It is based on these descents that they claimed the English crown.  Compared with the House of Lancaster, it had a senior claim to the throne of England according to cognatic primogeniture but junior claim according to the agnatic primogeniture.  The reign of this dynasty ended with the death of Richard III of England in 1485.  It became extinct in the male line with the death of Edward Plantagenet, 17th Earl of Warwick in 1499.

2015–16 AFA Senior Male League: The 2015–16 AFA Senior Male League is the seventeenth season of the AFA Senior Male League, the only football league in Anguilla.  The season began on 15 November 2015.  The league was won by Salsa Ballers FC for the first time.

Sir Henry Thompson, 3rd Baronet: The Revd.  Sir Henry Thompson, 3rd Baronet Thompson of Virkees (5 November 1796 – 1 July 1868) was the third son of Sir Charles Thompson, 1st Baronet, and Jane Selby.  He succeeded to the baronetcy after his eldest brother the 2nd Baronet died without issue in 1826.  On 26 February 1826 he married Hannah Jean Grey, third daughter of Sir George Grey, 1st Baronet, of Falloden, KCB, Commissioner at Portsmouth Dockyard, and Mary Whitbread, daughter of Samuel Whitbread.  Sir George Grey was the third son of Charles Grey, 1st Earl Grey, and younger brother of Charles Grey, 2nd Earl Grey.

Anthony FitzClarence, 7th Earl of Munster: Anthony Charles FitzClarence, 7th Earl of Munster (21 March 1926 – 30 December 2000) was the last Earl of Munster, Viscount FitzClarence and Baron Tewkesbury.  The Earl of Munster was the last of the senior male line of FitzClarences that began with King William IV (Duke of Clarence until his accession in 1830) and his mistress, the comic actress Dorothea Jordan (née Bland).

William IV of the United Kingdom: William IV (William Henry; 21 August 1765 – 20 June 1837) was King of the United Kingdom of Great Britain and Ireland and King of Hanover from 26 June 1830 until his death.  The third son of George III and younger brother and successor to George IV, he was the last king and penultimate monarch of Britain's House of Hanover.

Hall, Lanteglos-by-Fowey: 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).

Viscount Molesworth: Viscount Molesworth, of Swords in the County of Dublin, is a title in the Peerage of Ireland.  It was created in 1716 for Robert Molesworth.  He was made Baron Philipstown, of Swords in the County of Dublin, at the same time, also in the Peerage of Ireland.  Molesworth had been invested as member of the Irish Privy Council in 1697, represented Camelford, Lostwithiel, East Retford and Mitchell in the British House of Commons and served as British Ambassador to Denmark.  His elder son, the second Viscount, notably served as Ambassador to the Kingdom of Sardinia, the Grand Duchy of Tuscany and the Republic of Venice.  He was succeeded by his younger brother, the third Viscount.  He was a Field Marshal in the Army.  On the death of his son, the fourth Viscount, this line of the family failed, and the titles passed to the latter's first cousin, the fifth Viscount.  He was the eldest son of the Hon. William Molesworth, third son of the first Viscount.  His son, the sixth Viscount, was a Major-General in the Army, who was lost in the wreck of "Arniston".  On his death this line of the family also failed and the titles were inherited by his second cousin, the seventh Viscount.  He was the eldest son of Richard, third son of the Hon. William Molesworth, third son of the first Viscount.  He was succeeded by his nephew, the eighth Viscount.  s of 2010 , the titles are held by the latter's great-grandson, the twelfth Viscount, who succeeded his father in 1997.

Supporting paragraphs: Anthony FitzClarence, 7th Earl of Munster William IV of the United Kingdom
Answer: George IV