Question: Which son of Sophia of Hanover ruled part of the Holy Roman Empire?

full_context: Document 1: Sophia of Hanover: Sophia of the Palatinate (commonly referred to as Sophia of Hanover; 14 October 1630 – 8 June 1714) was the Electress of Hanover from 1692 to 1698. As a granddaughter of James VI and I, she became heir presumptive to the crowns of the Kingdom of England and the Kingdom of Ireland under the Act of Settlement 1701. After the Acts of Union 1707, she became heir presumptive to the unified throne of the Kingdom of Great Britain. She died less than two months before she would have become queen, and her claim to the throne passed on to her eldest son, George Louis, Elector of Hanover, who ascended as George I on 1 August 1714 (Old Style).
Document 2: 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.
Document 3: Succession to the British throne: Succession to the British throne is determined by descent, gender (for people born before October 2011), legitimacy, and religion. Under common law, the Crown is inherited by a sovereign's children or by a childless sovereign's nearest collateral line. The Bill of Rights 1689 and the Act of Settlement 1701, restrict succession to the throne to the legitimate Protestant descendants of Sophia of Hanover that are in "communion with the Church of England". Spouses of Roman Catholics were disqualified from 1689 until the law was amended in 2015. Protestant descendants of those excluded for being Roman Catholics are eligible.
Document 4: State Crown of George I: The State Crown of George I is the imperial and state crown manufactured in 1714 for King George I. It was modified and used by subsequent monarchs until 1838. The empty gold frame and its 'aquamarine' monde which dates from the reign of King James II are both part of the Crown Jewels of the United Kingdom. They are on public display in the Martin Tower at the Tower of London.
Document 5: Descendants of James VI and I: James VI and I (19 June 1566 – 27 March 1625), the only child of Mary, Queen of Scots, was King of Scots from 1567 and King of England and Ireland from 1603, being the first monarch of the House of Stuart to rule all three countries. His descendants include Elizabeth II of the United Kingdom, Philippe of Belgium, Felipe VI of Spain, Carl XVI Gustaf of Sweden, Margrethe II of Denmark, Harald V of Norway, Willem-Alexander of the Netherlands, and Henri, Grand Duke of Luxembourg. This article deals with numerous descendants of James and his wife Anne of Denmark (Since he is not known to have had any illegitimate children).
Document 6: 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 7: 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 8: Anne, Queen of Great Britain: Anne (6 February 1665 – 1 August 1714) became Queen of England, Scotland and Ireland on 8 March 1702. On 1 May 1707, under the Acts of Union, two of her realms, the kingdoms of England and Scotland, united as a single sovereign state known as Great Britain. She continued to reign as Queen of Great Britain and Ireland until her death.
Document 9: Charlotte of Mecklenburg-Strelitz: Charlotte of Mecklenburg-Strelitz (Sophia Charlotte; 19 May 1744 – 17 November 1818) was by marriage to King George III the Queen of Great Britain and Ireland from her wedding in 1761 until the union of the two kingdoms in 1801, after which she was Queen of the United Kingdom of Great Britain and Ireland until her death in 1818. She was also the Electress of Hanover in the Holy Roman Empire until the promotion of her husband to King of Hanover on 12 October 1814, after which she was also queen consort of Hanover.
Document 10: Sophia Dorothea of Celle: Sophia Dorothea of Celle (15 September 1666 – 13 November 1726) was the repudiated wife of George I, King of Great Britain and mother of George II. The union with her first cousin was an arranged marriage of state, instigated by the machinations of his mother, Sophia of Hanover. She is best remembered for her alleged affair with Philip Christoph von Königsmarck that led to her being imprisoned in the Castle of Ahlden for the last thirty years of her life.
Document 11: 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 12: James VI and I: James VI and I (James Charles Stuart; 19 June 1566 – 27 March 1625) was King of Scotland as James VI from 24 July 1567 and King of England and Ireland as James I from the union of the Scottish and English crowns on 24 March 1603 until his death. The kingdoms of Scotland and England were individual sovereign states, with their own parliaments, judiciary, and laws, though both were ruled by James in personal union.
Document 13: 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 14: 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 15: Alternative successions of the English crown: The succession to the Crown of the United Kingdom is determined by the Act of Settlement 1701. This Act provided that, should William III and Anne both die without issue, the Crown would be settled on Sophia of Hanover (a granddaughter of King James VI and I) and her Protestant heirs. At the time the Act was passed, it was highly likely that both William and Anne would die without issue, and this indeed proved to be the case. This law has applied ever since, except for an amendment passed in 1936 that any descendants of Edward VIII would have no claim whatsoever to the Crown. This amendment proved academic, as the abdicated King Edward VIII died without issue in 1972.
ground_truth: George I