What nation originally discovered the island of cuba?

The correct answer is Spain.  

The island of Cuba was discovered in 1492 by Christopher Columbus during his first trip toward the New World. Columbus had been sponsored by the Spanish monarchs to carry out this voyage; consequently, in honor to these monarchs, he called the island Juana. The island then received various names until it was finally called Cuba, a variant of her aboriginal name Cubanascan.  

answer: idk

explanation:

the conditions that made the byzantine empire vulnerable to attacks by the muslin turks were the sack of constantinople by western crusaders, the conquests of the sultanate of rum, presence of rival kingdoms and finally the set up of fiefdoms at the empire which were owned by the ghazis (turkish warriors).