Afonso IV of Portugal
One (unproven) hypothesis is that the Azores were discovered in the course of a mapping expedition in 1341 to the Canary Islands, sponsored by King Afonso IV of Portugal, and commanded by the Florentine Angiolino del Tegghia de Corbizzi and the Genoese Nicoloso da Recco. Although not quite described in the 1341 report, Madeira and the Azores might nonetheless have been seen from a distance on the expedition's return via a long sailing arc ("volta do mar") from the Canary islands.