'Letter of the sultan of Cairo to the emperor of the Romans'
Date: Between 1422 and 1437 (possibly May 1437)
Original Language: Arabic
The text of this letter has only been preserved in a Greek translation, which might, however, originate from the sultan’s court itself; it is probable that the Melkite patriarchate of Alexandria was involved in its drafting (cf. Korobeinikov, 'Diplomat…