Abdullah Ibn-Mohammed Al-Khalifa or Abdullah al-Khalifa or Abdullahi al-Khalifa, also known as "The Khalifa" (; 1846 – November 25, 1899) was a Sudanese Ansar  ruler (like king or royal) who was one of the principal followers of Muhammad Ahmad. Ahmad claimed to be the Mahdi, building up a large following. After his death Abdallahi ibn Muhammad took over the movement, adopting the title of Khalifat al-Mahdi (usually rendered as "Khalifa"). He attempted to create a kingdom, which led to widespread discontent, and his eventual defeat and death at the hands of the British.