Abdallahi ibn Muhammad
Muhammad Ahmad or Muhammad Ahmad bin Abd Allah (12 August 1844 – 22 June 1885), a Sudanese Sufi sheikh of the Samaniyya order, declared himself Mahdi in June 1881 and went on to lead a successful military campaign against the Turko-Egyptian government of Sudan. Although he died shortly after capturing the Sudanese capital, Khartoum (1885), the Mahdist state continued under his successor, Abdallahi ibn Muhammad, until 1898, when it fell to the British army following the Battle of Omdurman.