Question:  Prince George William of Great Britain is the son of the King of Great Britain who started his reign on what date?

full_context: Document 1: Prince William of Gloucester: Prince William of Gloucester (William Henry Andrew Frederick; 18 December 1941 – 28 August 1972) was a grandson of King George V of the United Kingdom and cousin of Queen Elizabeth II.
Document 2: Prince George of Denmark: Prince George of Denmark and Norway, Duke of Cumberland (Danish: "Jørgen" ; 2 April 165328 October 1708), was the husband of Queen Anne, who reigned over Great Britain from 1702.
Document 3: Prince George William of Great Britain: Prince George William of Great Britain (13 November 1717 – 17 February 1718) was an infant member of the British royal family, second son of George II and Caroline of Ansbach who, at the time of his birth, were the Prince and Princess of Wales. He died aged 3 months, 4 days.
Document 4: George I of Great Britain: George I (George Louis; German: "Georg Ludwig" ; 28 May 1660 – 11 June 1727) was King of Great Britain and Ireland from 1 August 1714 until his death, and ruler of the Duchy and Electorate of Brunswick-Lüneburg (Hanover) in the Holy Roman Empire from 1698.
Document 5: George William, Duke of Brunswick-Lüneburg: George William German: "Georg Wilhelm" (Herzberg am Harz, 26 January 1624 – 28 August 1705, Wienhausen) was Duke of Brunswick-Lüneburg. He ruled first over the Principality of Calenberg, a subdivision of the duchy, then over the Lüneburg subdivision. In 1689, he occupied the Duchy of Saxe-Lauenburg and passed it on to his successors. George William was the father of Sophia Dorothea of Celle, wife of George I of Great Britain.
Document 6: Prince Georg of Hanover: Prince Georg of Hanover ("Georg Paul Christian Prinz von Hannover"), Duke of Brunswick-Lüneburg (born 9 December 1949 at Schloss Salem in Salem, Baden-Württemberg, Germany). Georg is the second eldest son of Prince George William of Hanover and his wife Princess Sophie of Greece and Denmark, an elder sister of Prince Philip, Duke of Edinburgh. Georg is a male-line descendant of George III of the United Kingdom and Charlotte of Mecklenburg-Strelitz and a descendant of Albert, Prince Consort and Victoria of the United Kingdom through their daughters Victoria, Princess Royal and Princess Alice of the United Kingdom. He is a first cousin of Charles, Prince of Wales and nephew of Prince Philip, Duke of Edinburgh and Elizabeth II of the United Kingdom.
Document 7: Dorothea Friederike of Brandenburg-Ansbach: Dorothea Friederike of Brandenburg-Ansbach (12 August 1676, Ansbach – 13 March 1731, Hanau) was the daughter of Margrave John Frederick of Brandenburg-Ansbach (1654 – 1686) and his first wife, Margravine Johanna Elisabeth of Baden-Durlach (1651 – 1680). She was a half-sister of Queen Caroline of Great Britain, the wife of King George II
Document 8: Prince George, Duke of Kent: Prince George, Duke of Kent, {'1': ", '2': ", '3': ", '4': "} (George Edward Alexander Edmund; 20 December 1902 – 25 August 1942) was the fourth son of George V of the United Kingdom and Queen Mary.
Document 9: Prince George of Cambridge: Prince George of Cambridge (George Alexander Louis; born 22 July 2013) is the elder child and only son of Prince William, Duke of Cambridge, and Catherine, Duchess of Cambridge. He is third in line of succession to the British throne, after his paternal grandfather, and father.
Document 10: William II, Prince of Orange: William II (27 May 1626 – 6 November 1650) was sovereign Prince of Orange and stadtholder of the United Provinces of the Netherlands from 14 March 1647 until his death three years later. His only child, William III, reigned as King of England, Ireland, and Scotland.
Document 11: Prince William, Duke of Gloucester: Prince William, Duke of Gloucester (24 July 1689 – 30 July 1700 ) was the son of Princess Anne, later Queen of England, Ireland and Scotland from 1702, and her husband, Prince George, Duke of Cumberland. He was their only child to survive infancy. Styled Duke of Gloucester, he was viewed by contemporaries as a Protestant champion because his birth seemed to cement the Protestant succession established in the "Glorious Revolution" that had deposed his Catholic grandfather James II the previous year.
Document 12: Prince William, Duke of Cambridge: Prince William, Duke of Cambridge, {'1': ", '2': ", '3': ", '4': "} (William Arthur Philip Louis; born 21 June 1982) is the elder son of Charles, Prince of Wales, and Diana, Princess of Wales. He is second in the line of succession to the British throne, after his father.
Document 13: George III of the United Kingdom: George III (George William Frederick; 4 June 1738 – 29 January 1820) was King of Great Britain and Ireland from 25 October 1760 until the union of the two countries on 1 January 1801, after which he was King of the United Kingdom of Great Britain and Ireland until his death. He was concurrently Duke and prince-elector of Brunswick-Lüneburg ("Hanover") in the Holy Roman Empire until his promotion to King of Hanover on 12 October 1814. He was the third British monarch of the House of Hanover, but unlike his two predecessors, he was born in Britain, spoke English as his first language, and never visited Hanover.
Document 14: George II of Great Britain: George II (George Augustus; German: "Georg II. August" ; 30 October / 9 November 1683  – 25 October 1760) was King of Great Britain and Ireland, Duke of Brunswick-Lüneburg (Hanover) and Prince-elector of the Holy Roman Empire from 11 June 1727 (O.S.) until his death.
Document 15: George IV of the United Kingdom: George IV (George Augustus Frederick; 12 August 1762 – 26 June 1830) was King of the United Kingdom of Great Britain and Ireland and of Hanover following the death of his father, George III, on 29 January 1820, until his own death ten years later. From 1811 until his accession, he served as Prince Regent during his father's final mental illness.
ground_truth: 11 June 1727