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

Context paragraphs:
Malabar Special Police: The Malabar Special Police (MSP) is a paramilitary unit of the State Police of Kerala, India.  This unit also trains new recruits and also helps the local police units to maintain law and order during emergencies.  During emergencies, this unit forms the riot police platoons fully equipped with riot gear.  This police unit is known for its extraordinarily tough training, and the high quality of its firing and military drills.

Aggabodhi III of Anuradhapura: Aggabodhi III was King of Anuradhapura in the 7th century, whose reign lasted the year 623 and from 624 to 640.  He succeeded his father Silameghavanna as King of Anuradhapura and was succeeded by Jettha Tissa III in his first reign and Dathopa Tissa I in his second.

Black Swans (special forces): The Black Swans (Bosnian: "Crni Labudovi" ) was a paramilitary unit and special forces unit in the Army of the Republic of Bosnia and Herzegovina.  It was a "Patriotic League" unit formed in 1992 in Sapna under the 2nd Corps (later 1st Corps), which eventually numbered 800 men.  It was one of several special Bosnian Muslim units.  It earned a reputation for battlefield bravery.  The first commander Senad Mehdin Hodžić was a former member of the Special anti-terrorist unit of the Yugoslav Ministry of Internal Affairs (MUP), when he took the command of the Black Swans he would be known as "Kapetan Labud" or Captain Swan.  Then Captain Hajro Mešić took over for a while.  The most successful and lasting commander was Brigadier Hase Tirić.  The area of operation was Konjic, Igman and Jablanica.  Black Swans wore black uniforms with a unit patch on the sleeves and the ARBIH patch on the other sleeve.

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.

Alara of Nubia: Alara was a King of Kush who is generally regarded as the founder of the Napatan royal dynasty by his 25th Dynasty Nubian successors and was the first recorded prince of Nubia.  He unified all of Upper Nubia from Meroë to the Third Cataract and is possibly attested at the Temple of Amun at Kawa.  Alara also established Napata as the religious capital of Nubia.  Alara himself was not a 25th dynasty Nubian king since he never controlled any region of Egypt during his reign compared to his two immediate successors: Kashta and Piye respectively.  Nubian literature credits him with a substantial reign since future Nubian kings requested that they might enjoy a reign as long as Alara's.  His memory was also central to the myth of the origins of the Kushite kingdom which was embellished with new elements over time.  Alara was a deeply revered figure in Nubian culture and the first Nubian king whose name has come down to scholars.

Mittasena of Anuradhapura: Mittasena (or Mitta Sena or Karalsora) was King of Anuradhapura in the 5th century, whose reign lasted from 435 to 436.  He succeeded Chattagahaka Jantu as King of Anuradhapura.  During his reign, the kingdom was invaded by Pandu of The Six Dravidians.

Sigfred: Sigfred also called Sigurd Hring was possibly the second official king of Denmark whose reign started no later than the 770s and ended around 800.  The precise dates remains unknown.

Gothabhaya of Anuradhapura: Gothabhaya, also known as Meghavannabhaya, Gothakabhaya and Goluaba, was a king of the Anuradhapura Kingdom of Sri Lanka whose reign lasted from 254 to 267.  During his reign, Gothabhaya renovated several temples and monasteries and also built a new temple.  He is the last of three friends who seized the throne from King Vijaya Kumara and ruled the country.  He is known for banishing 60 Buddhist monks who followed teaching contradictory to Theravada, and also for rebelling against his friend Samghabodhi to seize the throne himself.

Nicholas I of Russia: Nicholas I (Russian: Николай I Павлович , "Nikolay I Pavlovich" ; 6 July [O.S. 25 June] 1796 – 2 March [O.S. 18 February] 1855 ) was the Emperor of Russia from 1825 until 1855.  He was also the King of Poland and Grand Duke of Finland.  He is best known as a political conservative whose reign was marked by geographical expansion, repression of dissent, economic stagnation, poor administrative policies, a corrupt bureaucracy, and frequent wars that culminated in Russia's defeat in the Crimean War of 1853–56.  His biographer Nicholas V. Riasanovsky says that Nicholas displayed determination, singleness of purpose, and an iron will, along with a powerful sense of duty and a dedication to very hard work.  He saw himself as a soldier—a junior officer totally consumed by spit and polish.  A handsome man, he was highly nervous and aggressive.  Trained as an engineer, he was a stickler for minute detail.  In his public persona, says Riasanovsky, "Nicholas I came to represent autocracy personified: infinitely majestic, determined and powerful, hard as stone, and relentless as fate."  His reign had an ideology called "Official Nationality" that was proclaimed officially in 1833.  It was a reactionary policy based on orthodoxy in religion, autocracy in government, and Russian nationalism.  He was the younger brother of his predecessor, Alexander I.  Nicholas inherited his brother's throne despite the failed Decembrist revolt against him and went on to become the most reactionary of all Russian leaders.  His aggressive foreign policy involved many expensive wars, having a disastrous effect on the empire's finances.

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.

Supporting paragraphs: Guelphic Legion George V of Hanover
Answer: the Unification of Germany