There was no discovery here, for the whole Canarian archipelago was now pretty well known to French and Spanish mariners, especially since the conquest of 1402-06 by French adventurers under Castilian overlordship; but in 1418 Henry's captain, Joao Goncalvez Zarco rediscovered Porto Santo, and in 1420 Madeira, the chief members of an island group which had originally been discovered (probably by Genoese pioneers) before 1351 or perhaps even before 1339, but had rather faded from Christian knowledge since.
(about 1370), has been the subject of much controversy; in any case it does not affect the original Italian discovery, nor the first sighting of Porto Santo by Zarco, who, while exploring the west African mainland coast, was driven by storms to this island.
In 1418 Portuguese mariners Joao Goncalves Zarco and Tristao Vaz Teixeira stumbled across it while running from a storm.
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