In this study, we are concerned with the Nilotic tribes of the Shilluk, Nuer, Dinka, Nuba, Acholi, and with the southwestern group of the Azande and associated groups of the Sudan. The term Nilotic, as used by anthropologists, refers to certain groups in the Nile Valley, Uganda, Kenya, and Tanganyika who have closely related physical, linguistic and cultural characteristics, as well as traditions and myths suggesting a common origin.