Marginalia in a manuscript of the gospels belonging to the commercial school at Chalke provide us the date of the imprisonment of the five men: Saturday, 26 March 1463. This date is verified by another manuscript containing the "Histories" of Thucydides belonging to the London Medical Society, which also adds that David's sons had converted to Islam under the influence of members of the Kabasitanoi who had done so out of hunger. They were taken to Constantinople and imprisoned in the Beyoğlu jail, where with five others the last of the Komnenoi were executed with the sword on 1 November 1463 at the fourth hour of the night. Their execution is confirmed by a letter written by the Patriarch Sophronios I, who wrote that David "with his three sons" was killed "a few days" after his arrival at Constantinople.