In 1692, the Holy Roman Emperor Leopold I elevated the Duchy of Brunswick-Lüneburg to the status of an Electorate, known as the Electorate of Hanover. This elevation allowed the Electors of Hanover to participate in the election of the Holy Roman Emperor and significantly increased their political influence. The first Elector of Hanover was Ernest Augustus, whose son, George Louis, ascended to the British throne as George I in 1714 due to the Act of Settlement 1701 and ensured a Protestant succession. This personal union of the British crown and the Electorate of Hanover lasted until 1837.
The Electorate of Hanover became the Kingdom of Hanover in 1814, following the defeat of Napoleon and the reorganization of German territories at the Congress of Vienna. The Kingdom was granted to George III, who had ruled the Electorate of Hanover with the title of Prince-elector. This marked Hanover's rise to greater political significance within the German Confederation. However, the dual monarchy system created complexities, especially as the British and Hanoverian thrones had separate succession laws. When Queen Victoria ascended the British throne in 1837, Hanoverian semi-Salic law (agnatic-cognatic) gave priority to all male lines before female lines. Consequently, Victoria's uncle, Ernest Augustus, Duke of Cumberland, became King of Hanover.
The Kingdom of Hanover faced significant challenges during the mid-19th century, particularly during the Austro-Prussian War in 1866. Despite aligning with the Austrian Empire, Hanover was annexed by Kingdom of Prussia after Austria's defeat, thereby forfeiting its autonomy as a kingdom. Subsequently, the region became part of the German Empire in 1871, following Prussia's unification of Germany. Local resistance and regional loyalty led Hans von Hardenberg, the civil commissioner who oversaw the integration of Hanover into Prussia, to remark that:
As a whole the Hanoverians are a tougher, less accommodating tribe than the Saxons. Their particularism rests not solely on Prussophobia ... but above all on a deep-rooted conviction that life is nowhere better than in Hanover. Theirs is a solid ... national feeling.
Ernest Augustus was appointed as the first Elector of Hanover in 1692, but he died in 1698 before the Imperial Diet confirmed the elevation of Hanover to the status of an Electorate in 1708. His widow, Sophia of Hanover, was still known as Electress of Hanover. Their son was George I.
Became King of the United Kingdom (by way of the act of union with Ireland) in 1801. He acquired the Prince-Bishopric of Osnabrück in 1803. He lost (early 1801), regained (April 1801), lost again (May 1803), regained again (Autumn 1805), lost for a third time (early 1806), and regained for a third time (October 1813) de facto power in Hanover by various occupations and annexations during the Great French War (1801–1813). After the electoral title became defunct, with the dissolution of the Holy Roman Empire in 1806, nonetheless between 1806 and 1814, the dissolution of the Holy Roman Empire was not recognised and George III retained the electoral title until early 1814 when George was proclaimed King of Hanover, a title which was universally recognised during the Congress of Vienna (1814–15).
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