Sayyid Muhammad Abd Allah al-Hasan (1856-1920), referred to by the British as the Mad Mullah, was a Somali religious and nationalist leader. He founded the Dervish State in Somalia that fought an anti-imperial war against British, Italian and Ethiopian forces for over 20 years.
These lines are taken from the anonymously written Irish street ballad, "The Wearing of the Green". The context of the song is the repression around the time of the Irish Rebellion of 1798, when the wearing of revolutionary insignia was punishable by hanging.
("The Wearing of the Green" performed by John McCormack)