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 Ottoman-Egyptian rule in Sudan which culminated in a remarkable victory over the British in the Siege of Khartoum, while also slowing and defeating the British during their unsuccessful Nile Expedition to resupply the Khartoum Garrison. 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.

The Mahdi is a prominent figure in Islamic eschatology who is believed to appear at the End of Time to rid the world of evil and injustice. He is said to be a descendant of Muhammad, who will appear shortly before Jesus and will lead the Muslim Ummah to rule the entire world.