crown. He refused, believing that a stadholdership would give him more power. Thus, on December 6, William proclaimed himself hereditary sovereign prince of the Netherlands—something between a kingship and a stadholdership. In 1814, he was awarded sovereignty over the Austrian Netherlands and the Prince-Bishopric of Liège as well. On March 15, 1815 with the support of the powers gathered at the Congress of Vienna, William proclaimed himself King William I. He was also made grand duke of Luxembourg, and (to assuage French sensitivity by distancing the title from the now-defunct principality) the title 'Prince of Orange' was changed to 'Prince of Oranje'. The two countries remained separate, though they shared a common monarch via a personal union. William had thus fulfilled the House of Orange's three-century quest to unite the Low Countries. The institution of the monarch in the Netherlands is considered an office under the Constitution of the Netherlands. There are none of the religious connotations to the office as in some other monarchies. A Dutch sovereign is inaugurated rather than crowned in a coronation ceremony. It was initially more of a crowned/hereditary presidency, and a continuation of the status quo ante of the pre-1795 hereditary stadholderate in the Republic. In practice, the current monarch has considerably less power than the stadtholder. As king of the United Kingdom of the Netherlands, William tried to establish one common culture. This provoked resistance in the southern parts of the country, which had been culturally separate from the north since 1581. He was considered an enlightened despot. The Prince of Orange held rights to Nassau lands (Dillenburg, Dietz, Beilstein, Hadamar, Siegen) in central Germany. On the other hand, the King of Prussia, Frederick William III—brother-in-law and first cousin of William I, had beginning from 1813 managed to establish his rule in Luxembourg, which he regarded as his inheritance from Anne, Duchess of Luxembourg who had died over three centuries earlier. At the Congress of Vienna, the two brothers-in-law agreed to a trade—Frederick William received William I's ancestral lands while William I received Luxembourg. Both got what was geographically nearer to their center of power. In 1830, most of the southern portion of William's realm—the former Austrian Netherlands and Prince-Bishopric—declared independence as Belgium. William fought a disastrous war until 1839 when he was forced to settle for peace. With his realm halved, he decided to abdicate in 1840 in favour of his son,