One such group from Bunyoro, headed by Prince Kimera, arrived in Buganda early in the 15th century. Assimilation of refugee elements had already strained the ruling abilities of Buganda's various clan chiefs and a supraclan political organization was already emerging. Kimera seized the initiative in this trend and became the first effective "Kabaka" (ruler) of the fledgling Buganda state. Ganda oral traditions later sought to disguise this intrusion from Bunyoro by claiming earlier, shadowy, quasisupernatural kabakas. Others believe that it's not superstition, Kabaka_of_Buganda.