Question:  The Guelphic Legion was a paramilitary unit maintained at the expense of a king whose reign was ended by what?

full_context: Document 1: 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 2: George V of Hanover: George V (George Frederick Alexander Charles Ernest Augustus; German: "Georg Friedrich Alexander Karl Ernst August" ; 27 May 1819 – 12 June 1878) was the last king of Hanover, the only child and successor of King Ernest Augustus. George V's reign was ended by the Unification of Germany.
Document 3: 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 4: George V: George V (George Frederick Ernest Albert; 3 June 1865 – 20 January 1936) was King of the United Kingdom and the British Dominions, and Emperor of India, from 6 May 1910 until his death in 1936.
Document 5: Army Group Rupprecht of Bavaria: The Army Group Rupprecht of Bavaria or Army Group A (German: "Heeresgruppe Kronprinz Rupprecht von Bayern") was an Army Group of the German Army, which operated on the Western Front under command of Rupprecht, Crown Prince of Bavaria , between 28 August 1916 and 11 November 1918 during World War I. It was formed from the short-lived Army Group Gallwitz under Max von Gallwitz (19 July - 28 August 1916).
Document 6: Walloon Legion: The Walloon Legion (French: "Légion Wallonie" ) was a collaborationist volunteer unit recruited from Belgium's French-speaking population in Wallonia and Brussels during the German occupation of World War II. The Walloon Legion served in the Wehrmacht, later in the Waffen-SS, on the Eastern Front on both front line and reserve duties.
Document 7: 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 8: Westfalen Garrison: Westfalen Garrison is a major British garrison with facilities located in Paderborn, Sennelager and Gütersloh in North Rhine-Westphalia, Germany which now forms the major part of British Forces Germany. It is the home of 20th Armoured Brigade and most of its subordinate units. Headquarters Westfalen Garrison is based at Antwerp Barracks in Sennelager.
Document 9: Guelphic Legion: The Guelphic Legion (German: "Welfenlegion" ) was a Hanoverian paramilitary unit maintained at the expense of George V, deposed King of Hanover, from 1866 to 1870.
Document 10: 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 11: Heinrich Ewald: Georg Heinrich August Ewald (16 November 1803 – 4 May 1875) was a German orientalist, Protestant theologian, and Biblical exegete. He studied at the University of Göttingen. In 1827 he became extraordinary professor there, in 1831 ordinary professor of theology, and in 1835 professor of oriental languages. In 1837, as a member of the Göttingen Seven, he lost his position at Göttingen on account of his protest against King Ernest Augustus I of Hanover's abrogation of the liberal constitution, and became professor of theology at the University of Tübingen. In 1848, he returned to his old position at Göttingen. When Hanover was annexed by Prussia in 1866, Ewald became a defender of the rights of the ex-king. Among his chief works are: "Complete Course on the Hebrew Language" (German: "Ausführliches Lehrbuch der hebräischen Sprache" ), "The Poetical Books of the Old Testament" (German: "Die poetischen Bücher des alten Bundes" ), "History of the People of Israel" (German: "Geschichte des Volkes Israel" ), and "Antiquities of the People of Israel" (German: "Die Altertümer des Volkes Israel" ). Ewald represented the city of Hanover as a member of the Guelph faction in the North German and German Diets.
Document 12: Göttingen Seven: The Göttingen Seven (German: "Göttinger Sieben" ) were a group of seven professors from Göttingen. In 1837, they protested against the abolition or alteration of the constitution of the Kingdom of Hanover by Ernest Augustus and refused to swear an oath to the new king of Hanover. The company of seven was led by Friedrich Christoph Dahlmann, who himself was one of the key advocates of the unadulterated constitution. The other six were the Germanist brothers Wilhelm and Jacob Grimm (famed fairy tale and folk tale writers and storytellers, known together as the Brothers Grimm), jurist Wilhelm Eduard Albrecht, historian Georg Gottfried Gervinus, physicist Wilhelm Eduard Weber, and theologian and orientalist Heinrich Georg August Ewald.
Document 13: Heil dir, Hannover: Heil dir, Hannover (English: Hail to thee, Hanover), was the national anthem of the Electorate, and later Kingdom of Hanover, adopted in the early 18th century. Like other many rulers in the 17th & 18th century, George I of Hanover and Great Britain instructed George Handel to create an anthem. Handel's melody remained the United Kingdom of Great Britain and Ireland's anthem after the end of the personal union in 1837. Also many other German states made this melody their anthem. For example, it was used in the Grand Duchy of Oldenburg and the Kingdoms of Bavaria and Prussia. After 1871, it became the anthem of the German Empire with the lyrics "Heil dir im Siegerkranz". The last Holy Roman Emperor and German king, Francis II, was very impressed by Handel's theme an instructed his Court musician Haydn to create the "Kaiserhymne", which became his imperial anthem and continued to be used in the new Austrian Empire after he dissolved the Holy Roman Empire.
Document 14: Prince Christian of Hanover (born 1985): Prince Christian of Hanover (Christian Heinrich Clemens Paul Frank Peter Welf Wilhelm-Ernst Friedrich Franz Prince of Hanover, Duke of Brunswick and Lüneburg; born 1 June 1985) is the younger son of Ernst August, Prince of Hanover, and his first wife Chantal Hochuli. He is the second in the line of succession to the former Hanoverian throne, after his elder brother Prince Ernst August. As a descendant of George III of the United Kingdom, Christian is also in the line of succession to the British throne.
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: the Unification of Germany