Fra Mauro also comments that the account of the expedition, together with the relation by Strabo of the travels of Eudoxus of Cyzicus from Arabia to Gibraltar through the southern Ocean in Antiquity, led him to believe that the Indian Ocean was not a closed sea and that Africa could be circumnavigated by her southern end (Text from Fra Mauro map, 11, G2). This knowledge, together with the map depiction of the African continent, probably encouraged the Portuguese to intensify their effort to round the tip of Africa.