In the early 19th century, the Grand Duchy of Luxembourg was ruled in personal union by the King of the Netherlands, William I. The territory that is now Belgium was similarly part of the United Kingdom of the Netherlands. When the Belgian Revolution occurred in 1830, most of Luxembourg rallied to this Revolution, and accepted Belgian rule. The exception was the fortress and capital, Luxembourg City, which housed a Dutch-German garrison and remained loyal to William I. This led to a de facto separation of the country from 1830-1839, when most of it was loyal to and administered by Belgium, while one part retained allegiance to the Netherlands. The situation was resolved in 1839 when the international great powers and William I agreed that Luxembourg would remain in his possession, and lose its French-speaking parts to the new country of Belgium.