sentences:  Even if they were not discovered by the mapping expedition of 1341 itself, the islands may have been found by any of the numerous Majorcan expeditions that were launched into the Atlantic Ocean in the aftermath, destined for slaving runs on the newly mapped Canary islands.Regardless of who sighted them during the 14th century, there seems to have been no follow-ons until the 15th century.In the late 14th century, many maps appeared showing fictitious islands in the Atlantic.