On his way to Constantinople, Jean de La Forêt first landed in north Africa, where he offered Hayreddin Barbarossa fifty ships and supplies in exchange for help against Genoa.
[5] Jean de La Forêt was directed to seek trading privileges, as well as religious arrangements and military agreements between France and the Ottoman Empire.
[3] In exchange, Francis I proposed in his instructions to La Forêt: an ambassador, a perpetual treaty of alliance, trade and a promise "to hold all Christianity quiet, without war undertaken against him... in a universal peace", by weakening Charles V "until he can no more resist".
[3] Jean de la Foret also had secret military instructions to organize a combined offensive on Italy in 1535:[6] "Jean de la Forest, whom the King sends to meet with the Grand Signor [Suleiman the Magnificent], will first go from Marseilles to Tunis, in Barbary, to meet sir Haradin, king of Algiers, who will direct him to the Grand Signor.
To this objective, next summer, he [the King of France] with send the military force he is preparing to recover what it unjustly occupied by the Duke of Savoy, and from there, to attack the Genoese.
[8] In February 1536, de la Forêt obtained the signature of a commercial treaty called Capitulations (of which only a draft has been recovered), which was the foundation for French influence in the Ottoman Empire and the Levant until the 19th century.
He has always promised more than he can carry out", referring to the lack of French commitment in 1534–35, when Tunis was finally recaptured by Charles V, but he nevertheless agreed to the alliance upon Francis I's invasion of Piedmont in early 1536.
[13] The commercial treaty actually was something of a façade for Jean de La Forêt, whose main role was actually to coordinate military collaboration between France and the Ottoman Empire.