
Sayyīd Muhammad `Abd Allāh al-Hasan (Somali: Sayid Maxamed Cabdille Xasan, Arabic: محمّد عبد اللّه حسن) (April 7, 1856 – December 21, 1920) was a Somali religious and patriotic leader. Referred to as the Mad Mullah by the British, he established the Dervish State in Somalia that fought the 20 year Somaliland Campaign against British, Italian and Ethiopian forces.