Kigali Gisaka. By playing these neighbours against each other, the early kingdom flourished in the area, expanding westwards towards Lake Kivu and taking the Kigali area in the process. In the late 16th or early 17th centuries, the kingdom of Rwanda was invaded by the Banyoro and the kings forced to flee westward, leaving Kigali and eastern Rwanda in the hands of Bugesera and Gisaka. The formation in the 17th century of a new Rwandan dynasty by mwami Ruganzu Ndori, followed by eastward invasions and the conquest of Bugesera, marked the beginning of the Rwandan kingdom's dominance in the area. The
Kigali act as a water store and flood protection for the city, although these are under threat from agriculture and development. The central business district (CBD) (known in Kinyarwanda as "mu mujyi") of Kigali lies on Nyarugenge Hill, and was the site of the original city founded by Richard Kandt in 1907. The house that Kandt lived in is now a museum. Geographically, the CBD lies towards the western edge of the built-up area, as the terrain to the east was more suitable for development of the expanding city than the high slopes of Mount Kigali to the west. Several of