Can I play the Byzantines?

also, you know that people knew that the world was round during the middle ages, right? They had known since early Antiquity, the whole "medieval people thought the world was flat" myth came from a 19th century pseudo-biography on Christopher Columbus, and was later perpetuated by the Anti-Church movements to try and claim that they were making people ignorant and backwards. The idea that educated medieval people, the ones who would be commissioning a voyage, believed the earth was flat didn't appear until the 1930s. If anything, the opposition to Columbus in OTL was because they thought his math was wrong and he miscalculated the distance his ship was capable of traveling.