The Principality of Calenberg was a dynastic division of the Welf duchy of Brunswick-Lüneburg established in 1432. Calenberg was ruled by the House of Hanover from 1635 onwards; the princes received the ninth electoral dignity of the Holy Roman Empire in 1692. Their territory became the nucleus of the Electorate of Hanover, ruled in personal union with the Kingdom of Great Britain from 1714 onwards. The principality received its name from Calenberg Castle, a residence of the Brunswick dukes. Territory When Duke Eric I of Brunswick-Lüneburg chose the Principality of Calenberg as his part of the inheritance in 1495, he described it as "the land between the River Leine and the Deister". This geographical description, however, was never totally correct. In fact, the Principality extended west of the Leine from Schulenburg as far as Neustadt am Rübenberge in the north and thus much further north than the foothills of the Deister. To the south-west the territory stretched as far as Hamelin on the Weser, well beyond the Deister. The city of Hanover was largely independent of Welf territorial lordship, even though it was not formally a free imperial city. Not until George of Calenberg, who had been a successful general in the Thirty Years War, chose the city as his Residenz in 1636 could Hanover also be viewed as part of the Principality of Calenberg. Calenberg Castle was demolished and slighted between 1692 and 1694. Because of the link that had existed since 1463 between the principalities of Calenberg and Göttingen, the latter was also sometimes referred to as Calenberg. Today the term Calenberg Land is usually only used for the region between Hanover and the Deister. History Origins and foundation of Calenberg Castle Originally the territory belonged to the Duchy of Saxony but in 1180, after the imperial ban had been imposed on the Welf prince, Henry the Lion, he lost his ducal lands in Saxony and Bavaria. However, in 1235, Henry's grandson, Otto the Child, was promoted to the rank of prince as a result of the reconciliation between the Houses of Hohenstaufen and Welf and was given the allodial estates of the family claimed by them in the area between Lüneburg and Brunswick as the new and independent Duchy of Brunswick-Lüneburg. In the region west of Hanover, the Welfs had but few allodial possessions and so that area was disputed between the House of Welf and the