The Scottish traveler James Bruce will report…
1540 CE to 1683 CE
The Bahre-Nagassi ("Kings of the Sea") alternately fight with or against the Abyssinians and the neighboring Muslim Adal Sultanate, depending on the geopolitical circumstances.
Medri Bahri is thus part of the Christian resistance against Imam Ahmad ibn Ibrahim al-Ghazi of Adal's forces, but later joins the Adalite states and the Ottoman Empire front against Abyssinia in 1572.
The sixteenth century also marks the arrival of the Ottomans, who begin making inroads in the Red Sea area.