the 1450 Fra Mauro map, the Indian Ocean is depicted as connected to the Atlantic. Fra Mauro puts the following inscription by the southern tip of Africa, which he names the "Cape of Diab", describing the exploration by a ship from the East around 1420:

Fra Mauro explained that he obtained the information from "a trustworthy source", who traveled with the expedition, possibly the Venetian explorer Niccolò da Conti who happened to be in Calicut,