After Belgium became an independent country following the victorious Belgian Revolution of 1830-1831, it claimed the entire Grand-Duchy of Luxembourg as being part of Belgium, however the Dutch King who was also Grand Duke of Luxembourg, as well as Prussia, didn't want to lose their grip on the mighty fortress of Luxembourg and did not agree with the Belgian claims. The dispute would be solved at the 1839 Treaty of London where the decision of the Third Partition of Luxembourg was taken. This time the territory was reduced by more than half, as the predominantly francophone western part of the country was transferred to the new state of Belgium and with it giving Luxembourg its modern-day borders. The treaty of 1839 also established full independence of the remaining Germanic-speaking Grand-Duchy of Luxembourg.