The seven true hausa states, or hausa bakwai biram, daura, gobir, kano, katsina, rano, and zaria zazzau, and their seven outlying satellites, or banza bakwai zamfara, kebbi, yauri, gwari, nupe, kororofa jukun, and yoruba, had no central authority, were never combined in wars of conquest, and were therefore frequently subject to domination from outside.