King of Hanover
The Crown Prince succeeded his father as the King of Hanover and Duke of Brunswick-Lüneburg as well as Duke of Cumberland and Teviotdale, in the Peerage of Great Britain and Earl of Armagh, in the Peerage of Ireland, on 18 November 1851, assuming the style George V.
From his father and from his maternal uncle, Duke Charles of Mecklenburg, one of the most influential men at the Prussian court, George had learned to take a very high and autocratic view of royal authority. During his 15-year reign, he engaged in frequent disputes with the Hanoverian Landtag (parliament).
Unlike his father, the King had a deep aversion to Prussia, which bordered on the Kingdom of Hanover in the west and east. George was generally supportive of the Austrian Empire in the Diet of the German Confederation. He also refused Prussia permission to build the railway line from the Prussian garrison town of Minden to the Prussian naval port in Wilhelmshaven.
Against the decision of his parliament, he refused to agree to the Prussian demand for neutrality and thus a break with the German Confederation in the upcoming German War, but joined the other loyal central states. As the Austro-Prussian War started, the Prussian government sent a dispatch on 15 June 1866 demanding that Hanover enter into an alliance with them and Hanoverian troops submit to their authority or face war. Despite previously having concluded that Hanover could not win an armed confrontation with Prussia, George remained protective of his throne and refused the ultimatum. Contrary to the wishes of the parliament, Hanover joined the Austrian camp in the war. As a result, the 20,600-strong Hanoverian Army surrendered on 29 June 1866 following the Battle of Langensalza, although tactically successful but hopelessly outnumbered in soldiers. George V had joined his army headquarters in Göttingen. The Kingdom of Hanover was then occupied by Prussian troops. Austria lost the war and several of its Central German allies were annexed by Prussia, such as the Electorate of Hesse and the Duchy of Nassau. George firmly rejected an abdication in favour of his son Ernest Augustus, as suggested by Queen Marie in order to be able to possibly save the existence of the kingdom.
The Prussian government formally annexed Hanover on 20 September 1866, despite the King of Prussia, Wilhelm I, being a first cousin of King George V of Hanover; their mothers were sisters. The deposed King never renounced his rights to the defunct throne or acknowledged Prussia's actions. He went into exile in Austria. While the Austrian Emperor Franz Joseph I successfully campaigned for the continuation of the Kingdom of Saxony at the Prague peace negotiations, he did nothing to prevent the annexation of Hanover. The Prussian interest in the land bridge between the two parts of Prussia seemed to leave him little hope.
Queen Marie with their children stayed at Marienburg Castle for a year, but then followed her husband. They initially lived in Vienna, where George bought a house that is now the Czech Embassy, but in 1868 bought a summer villa in Gmunden, Austria, which they soon used as their main residence.
From exile he appealed in vain for the European great powers to intervene on behalf of Hanover. From 1866 to 1870, George V maintained the Guelphic Legion partially at his own expense, hoping that a Franco-Prussian war would lead to the reconquest of his kingdom. In Paris he had the magazine Situation published, which daily attacked the new order of things in Germany in the most violent terms and fueled France's hatred of a Germany that was becoming more and more Prussian. Much to his disappointment, Napoleon III lost the Franco-Prussian War in 1871.
All of this ultimately led to Prussia suspending financial compensation that had already been promised and confiscating his private assets. The Minister President of Prussia Otto von Bismarck had the sequestered assets, the so-called Guelph Fund, managed by a special Prussian commission in Hanover and used the proceeds "to combat Guelph activities".
While in exile, he was appointed an honorary full general in the British Army in 1876.
