As the title says, King Alfonso V of Aragon OTL received a letter from the Ethiopian king zara yaqob proposing an alliance against the Muslims, the sealing of the alliance would be the marriage of Alfonso brother, pedro with one of zara daughters Along with Pedro would go 13 aragonese courtiers , Alfonso V responded to the message by sending 13 courtiers to Ethiopia, all of whom died on the way, then Alfonso sent a message saying that he would agree to the alliance if Zara could guarantee a safe arrival, But apparently Alfonso's letter never reached Zara, But let's say that at least some courtiers manage to arrive in Ethiopia and later pedro marries one of the Ethiopian king's daughters, what could be the consequences of this alliance and marriage between the kingdoms.