From 1500's to 1965, but don't take my word for it. I wouldn't.
Belgium
Belgium took control of Rwanda in 1914-1918.
Rwanda was ruled by Belgium from about 1918-1960.
From Belgium
Rwanda was colonized by Germany until 1917.
Rwanda was a German colony from 1884 to 1919.At the end of WWI the League of Nations gave control of Rwanda to Belgium, which lasted from 1919 until the revolution in 1959.
Rwanda a small state that got its freedom from germany
Belgium
Germany and Belgium controlled Rwanda and Burundi.
Just as with the rest of the African continent, it was colonized by the European powers for the purpose of empire (money, expansion of global influence, to "civilize" the "dark continent"). I believe Rwanda's cash crop was coffee... Germany ruled Rwanda until WW1, then the territory was handed over to Belgium, then independence from Belgium in the 1960s.
Rwanda gained independence from Belgium 1 July 1962.
Rwanda was given to Belgium after the treaty of Versailles because it used to be part of German South East Africa