Adal Sultanate

State · 1415–1546 CE · at its largest around 1534 CE

A Muslim sultanate in the Horn of Africa centred on Zeila and later Harar. Under Imam Ahmad ibn Ibrahim al-Ghazi it invaded and overran much of the Ethiopian highlands in the 16th century.

On its lands while it lasted

• Coffee drinking in Yemen (c. 1450 CE): The earliest credible evidence of coffee drinking comes from Sufi circles in Yemen in the 15th century; the port of Mocha became the centre of the coffee trade.
• Ahmad ibn Ibrahim al-Ghazi (c. 1506 CE – 1543 CE): Imam of the Adal Sultanate, based at Harar, who conquered much of the Ethiopian highlands from 1529 until his death in battle in 1543.

More on Wikipedia.