The best info I have been able to find is in
this Petitfute page -
"In fact, four hills had this somewhat peculiar status of "capital", at least under King Mwezi Gisabo (19th century): Muramvya, Bukeye, Mbuye and Kiganda. On each of these hills lived a king's wife that he visited regularly, and he could also celebrate the feast of the muganuro.
Muramvya and Bukeye are the most accessible of these old "capitals" (paved roads, RN 2 or RN 1 from Bugarama). They are connected between them by an old track that makes a shortcut while avoiding Bugarama, but it is very bad. Mbuye and Kiganda are on both sides of the RN 2, taking the tracks in Gatabo. You can have a panoramic view of all these sites from a large flat of the RN 2, a few kilometers after Muramvya."Quite why the T List description "majors" on Mbuye from among the 4 isn't clear when the site title refers to another of the 4 at Muramvya! The T List text also mentions all 4 - "
Les principales capitales politiques se retrouvaient dans l'actuelle province de Muramvya notamment à Mbuye, à Muramvya, à Bukeye et à Kiganda"
Our current "dot" for Mbuye seems reasonably, if not exactly correctly, positioned but I can find nothing to help with identifying a more accurate location. The T List text states "
le domaine est entouré des collines Kiziba au sud, Buyaga à l'est, Iteka au nord, Mbuye à l'ouest. The map on this site provides a bit more info on these hills - but still doesn't identify the actual Domaine of Mbuye! See (scroll down) -
https://en.advisor.travel/city/Mbuye-159356But we could have chosen the Palace at Muramvya which is specifically identified on Google Maps at -3.262979, 29.621087 !!!
Kiganda is also specifically identified as being the site of the Treaty of Kiganda - -3.346910, 29.686176 See
here for info on KigandaI would have thought that the above would provide enough info to someone going to Burundi - going to Muramvya along RN2 will take one through Gatabo and locals could provide better info once there if reaching Mbuye was particularly important among the 4 locations??