The author reopens the file of the correspondences exchanged between Ahmad Tegüder (r. 1282-4), the first Ilkhan converted to Islam, and the Mamluk Sultan Qala’un (r. 1279-90). These correspondences have already given way to several publications (cf. P. M. Holt, “The Ilkhân Ahmad’s Embassies to Qalâwûn: Two Contemporary Accounts,” Bulletin of the School of Oriental and African Studies 49/1 (1986): 128-32; A. Allouche, “Tegüder’s Ultimatum to Qalawun,” International Journal of Middle Eastern Studies 22/4 (1990): 437-46). After retracing the history of modern research on the Ilkhanid embassy to Cairo, the author of the present paper analyses the second letter (June 1283), still unstudied by specialists, addressed by the Ilkhan to the Mamluk Sultan. J. Pfeiffer soundly observes that the tone of this letter is much more conciliatory that that of the preceding one (August 1282)—in which the proposal for peace was disguised by an order for submission, in the good old Mongol tradition. This new overture must be resituated in the context of its formulation: Ahmad Tegüder then searched to break the alliance that had been established between the Egyptian Mamluks and the Qans of the Golden Horde under the reign of Sultan Baybars (1260-77), considered as the real creator of the Mamluk Sultanate.