Born in the village of Barenton in Basse-Normandie, Postel made his way to Paris to further his education.
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In 1536, when Francis I sought a Franco-Ottoman alliance with the Ottoman Turks, he sent Postel as the official interpreter of the French embassy of Jean de La Forêt to the Turkish sultan Suleiman the Magnificent in Constantinople.
Guillaume Apollinaire | Guillaume Dufay | Guillaume Brahimi | Guillaume de Machaut | Guillaume-Chrétien de Lamoignon de Malesherbes | Jon Postel | Robert Guillaume | Guillaume | Toussaint-Guillaume Picquet de la Motte | Guillaume Thomas François Raynal | Guillaume Lejean | Arnaud Guillaume de Barbazan | Alfred Guillaume Gabriel, Count D'Orsay | Pierre Guillaume | Louis Augustin Guillaume Bosc | Jean Guillaume Bruguière | Jean Guillaume Audinet-Serville | Jean-Baptiste Claude Eugène Guillaume | Guillaume Groen van Prinsterer | Guillaume Grandidier | Guillaume Dupuytren | Guillaume Dubois | Guillaume du Bellay | Guillaume Depardieu | Guillaume de Nogaret | Guillaume Dasquié | Guillaume Couillard | Guillaume Canet | Guillaume Bigot | Guillaume-Antoine Olivier |
Gabriel de Luetz was accompanied by a vast suite of scientists, Jean de Monluc, philosopher Guillaume Postel, botanist Pierre Belon, naturalist Pierre Gilles d'Albi, the future cosmographer André Thévet, traveler Nicolas de Nicolay who would publish their findings upon their return to France and contribute greatly to the development of early science in France.