Muhammad Ahmad bin Abdullah bin Fahal was a Sudanese religious and political leader. In 1881, he claimed to be the Mahdi and led a war against Egyptian rule in Sudan, which culminated in a remarkable victory over them in the Siege of Khartoum. He created a vast Islamic state extending from the Red Sea to Central Africa and founded a movement that remained influential in Sudan a century later.
From his announcement of the Mahdist State in June 1881 until its end in 1899, the Mahdi's supporters, the Ansar, established many of its theological and political doctrines.