عبد الله التعايشي
After a prolonged struggle, by 1891 the Kalifa Abdallahi ibn Muhammad emerged as sole leader due to his support from the warlike nomadic Baggara Arabs of the west. He proved to be an able and ruthless ruler of the Mahdiyah, the Mahdist state. At first the state was run on military lines as a Jihadist state. Later, a more conventional form of administration was introduced. The Kalifa consolidated his rule in Sudan, then invaded Ethiopia, killing Emperor Yohannes IV in March 1889 and penetrating as far as Gondar. The same year, the Kalifa attacked Egypt at Tushki, but was defeated.