As some confusion prevails regarding the expression "Eastern Sudan," I may here explain that it bears a very different meaning, according as it is used in a political or an ethnical sense. Politically it is practically synonymous with Egyptian Sudan, that is the whole region from Darfur to the Red Sea which was ruled or misruled by the Khedivial Government before the revolt of the Mahdi (1883-4), and was restored to Egypt by the British occupation of Khartum in 1898. Ethnically Eastern Sudan comprises all the lands east of the Chad basin, where the Negro or Negroid populations are predominant, that is to say, Wadai, Darfur, and Kordofan in the West, the Nile Valley from the frontier of Egypt proper south to Albert Nyanza, both slopes of the Nile-Congo divide (the western tributaries of the White Nile and the Welle-Makua affluent of the Congo), lastly the Sobat Valley with some Negro enclaves east of the White Nile, and even south of the equator (Kavirondo, Semliki Valley). Throughout this region the fusion of the aborigines with Hamites and Arabs, Tuareg, or Tibu Moslem intruders, wherever they have penetrated, has been far less complete than in Central and Western Sudan. Thus in Wadai the dominant Maba people, whence the country is often called Dar-Maba ("Mabaland"), are rather Negro than Negroid, with but a slight strain of foreign blood. In the northern districts the _Zoghawa_, _Gura'an_, _Baele_ and _Bulala_ Tibus keep quite aloof from the blacks, as do elsewhere; the _Aramkas_, as the Arabs are collectively called in Wadai. Yet the _Mahamid_ and some other Bedouin tribes have here been settled for over 500 years, and it was through their assistance that the Mabas acquired the political supremacy they have enjoyed since the seventeenth century, when they reduced or expelled the _Tynjurs_[198], the former ruling race, said to be Nubians originally from Dongola. It was Abd-el-Kerim, founder of the new Moslem Maba state, who gave the country its present name in honour of his grandfather, _Wadai_. His successor Kharub I removed the seat of government to Wara, where Vogel was murdered in 1856. Abeshr, the present capital, dates only from the year 1850. Except for Nachtigal, who crossed the frontier in 1873, nothing was known of the land or its people until the French occupation at the end of the last century (1899). Since that date it has been prominent as the scene of the attack on a French column and the death of its leader, Colonel Moll, in 1910, and the tragic murder of Lieutenant Boyd Alexander earlier in the same year[199].