Atlantic voyage of the predecessor of Mansa Musa

In 1324, while staying in Cairo during his hajj, Mansa Musa, the ruler of the Mali Empire, told an Egyptian official whom he had befriended that he had come to rule when his predecessor led a large fleet in an attempt to cross the Atlantic Ocean and never returned. This account, recorded by the Arab historian al-Umari, has attracted considerable interest and speculation as a possible instance of pre-Columbian trans-oceanic contact.

Source: Wikipedia — Atlantic voyage of the predecessor of Mansa Musa (CC BY-SA 4.0)