Ahmad ibn Ibrahim al-Ghazi
Cristóvão da Gama (c. 1516 – 29 August 1542), anglicised as Christopher da Gama, was a Portuguese military commander who led a Portuguese army of 400 musketeers on a crusade in Ethiopia (1541–1543) against the far larger Adal Muslim army of Imam Ahmad ibn Ibrahim al-Ghazi (also known as Ahmad Gurey) aided by the Ottoman Empire.