 A member of the Gisaka dynasty killed Rwanda's king Ruganzu Bwimba in the 16th century, but Ruganzu's son Cyirima Rugwe fought back with help from Bugesera and was able to expand Rwanda's territory.In the late 16th or early 17th century, the kingdom of Rwanda was invaded from the north by the Banyoro of modern-day Uganda.The king was forced to flee westward, leaving Kigali and eastern Rwanda in the hands of Bugesera and Gisaka.