On 9 April 1520, a Portuguese embassy led by Ambassadors Dom Rodrigo de Lima and Mateus, and included missionary Francisco Álvares, arrived in Massawa to negotiate with Emperor Dawit II over the possibility of an alliance against Muslim countries. On 21 February 1543, the Portuguese aided the Ethiopians defeat the Adal Sultanate at the Battle of Wayna Daga ending the fourteen year Ethiopian–Adal war.