In 1813, the Netherlands was liberated from French rule by Prussian and Russian troops during the Napoleonic Wars. It was taken for granted that any new regime would have to be headed by the son of the last Dutch "stadhouder", William Frederik of Orange-Nassau. A provisional government was formed, most of whose members had helped drive out the House of Orange 18 years earlier. However, they realised that it would be better in the long term to offer leadership of the new government to William Frederik themselves rather than have him imposed by the allies. Accordingly, William Frederick was installed as the "sovereign prince" of a new Sovereign Principality of the United Netherlands. The future of the Southern Netherlands, however, was less clear. In June 1814, the Great Powers secretly agreed to the Eight Articles of London which allocated the region to the Dutch as William had advocated. That August, William Frederik was made Governor-General of the Southern Netherlands and the Prince-Bishop of Liège, which combined are almost all of what is now Belgium. For all intents and purposes, William Frederik had completed his family's three-century dream of uniting the Low Countries under a single rule.