Before or around 1530, for some reasons, he moved to France putting himself at the service of Francis I. The correspondence of diplomatic agents of the king of Portugal in France, in the first half of the century, tried to clarify the causes of this change of allegiance. Gaspar Palha, a Portuguese diplomat in Paris in 1531, having met a man from La Rochelle to whom he requested information concerning the pilot Jean Alfonse, wrote that he had been exiled because, when he was lost near the coast of Brittany hit by a storm, he had been involved in a quarrel that resulted in the death of his son or some man aboard; and that consequently he had been exiled and did not dare to appear in public, but it is a report by indirect testimony, and there may have been other non-criminal reasons for the exile. However, it appears that it was to escape the Portuguese Justice for some reason. Jean Alfonse left the country, later in the company of his wife and his sons. In 1531, John III attempted to repatriate the defector pilot because of his high qualifications and for his vast and possible classified knowledge. The king himself corresponded directly with Afonso, sending letters of pardon by his ambassadors and representatives and later exchanging letters with him in this attempt. By the 1540s, he was a renowned pilot, leading fleets to Africa and the Caribbean and reputed to have never lost a ship. André Thévet mentions a conversation where Alfonse described looting Puerto Rico as a corsair. It was long thought that the Rabelaisian hero Xenomanes was based on Alfonse. In 1542-43, Alfonse piloted Jean-François de la Roque de Roberval's attempt to colonize Canada on the heels of Jacques Cartier's third voyage there. Alfonse established that one could sail through a passage between Greenland and Labrador. The crew of 200, including prisoners and a few women, spent a harsh winter on the shores of the St. Lawrence River, hit by scurvy and losing a quarter of the colonists before sailing back to France. During this trip, Alfonse described a land he called Norombega. atlas from 1570, showing "Norvmbega" among other more or less mythical names for various areas In late 1544, Alfonse left La Rochelle with a small fleet and disrupted Basque shipping, while the treaty of Crépy had just been signed between France and Spain. A Spanish fleet led by Pedro Menéndez de Avilés caught up to him as he was getting back to La Rochelle and killed him at sea. Some sources say this fatal encounter occurred in 1549.
Works
His writings were published as Les voyages avantureux du Capitaine Ian Alfonce, the Rutter of Jean Alphonse and La cosmographie avec l’espère et régime du soleil du nord par Jean Fonteneau dit Alfonse de Saintonge, capitaine-pilote de François Ier. In them he describes the various places and peoples he and others have seen, many of them for the first time in print and provides navigational instructions on how to get there. 's atlas, 1547. Copy held by the http://nla.gov.au/nla.map-rm2393 [National Library of Australia
