In his Epitome of Military Science, the Roman writer Vegetius (fourth century C.E.) explained about navigation on that sea: “Some months are very suitable, some are doubtful, and the rest are impossible. ”
وِجیتیس در ادامه می‌گوید :‏ « از ۲۷ مه تا ۱۴ سپتامبر شرایط برای سفر دریایی کاملاً مساعد است .‏