Ahmad ibn Ibrahim al-Ghazi

 Ahmad ibn Ibrahim al-Ghazi  (1506 — 21 February 1543) was the Somali Imam of the Adal Sultanate from 1527 to 1543. Imam Ahmad (commonly named Ahmad Gurey in Somali, Gragn  in Amharic, and Gura in Afar, both meaning "the left-handed"), led the conquest of the Ethiopian Empire under the Sultanate of Adal during the Ethiopian-Adal War.

Quotes

 * O people of Islam, steadfastness means resolution, faint-heartedness means failure. Be sure of this, those who persevere are those who will vanquish. Faint-heartedness and cowardice are the twin causes of disappointment. God will see that whoever is constant triumphs over his enemy, for God is with him. Whoever holds his ground against the cutting edge of a sword, he is the achiever of the future; and will never again suffer fatigue. If he walks with God, his dwelling place shall be the more honoured, his efforts acknowledged, for God loves those who persevere.
 * The Conquest of Abyssinia, p. 74