Several explorers are known to have visited Rwanda during the late 19th and early 20th centuries. Notably, Richard Francis Burton, John Hanning Speke, and Henry Morton Stanley are three prominent explorers who are often associated with the exploration of East Africa, including the region that encompasses Rwanda.
Henry Morton Stanley is particularly well-known for his travels in the region during the 1870s, where he documented various territories in Africa, including Rwanda. If you have specific names or options in mind, please provide them for a more precise answer!