Not only were they staunchly Christian they also participated in the crusades. It was actually the end of the crusades that brought about the end of Nubia. It was Scotland in the Auld Alliance with France. Once the fight is over with the big dog. The annoying little neighbor who tries to stab you in the back gets the serious beat down. But Ethiopia was way to far South in easily defendable mountain terrain for it to be ever fully conquered, except possibly by Italy.
Nubia participated in the Crusades? How so? This is new to me.