Alexander conquered most of the known world, but his empire was not as large as the Roman Empire was to be. It is because of Alexander that the roman was so large. When Alexander finished his conquests there was not much left in the east to conquer. When the Romans conquered the Macedonians they took control of a large area of land. Alexander paved the way for more roman conquests. | Alexander conquered most of the known world, but his empire was not as large as the Roman Empire was to be. It is because of Alexander that the roman was so large. When Alexander finished his conquests there was not much left in the east to conquer. When the Romans conquered the Macedonians they took control of a large area of land. Alexander paved the way for more roman conquests. |