To surrender the city to you is beyond my authority or anyone else’s who lives in it, for all of us, after taking the mutual decision, shall die out of free will without sparing our lives.
Τὸ δὲ τὴν πόλιν σοὶ δοῦναι οὔτ' ἐμὸν ἐστίν οὔτ' ἄλλου τῶν κατοικούντων ἐν ταύτῃ• κοινῇ γὰρ γνώμῃ πάντες αὐτοπροαιρέτως άποθανοῦμεν καὶ οὐ φεισόμεθα τῆς ζωῆς ἡμῶν.
Original text (Ancient Greek)
Source, in full
Reply to Mehmed II's call for the surrender of Constaninople. George Sphrantzes. Greek: "29 Μαϊου 1453: Όταν "η Πόλις εάλω..." [29 May 1453: When the City Fell...]. iefemerida.com (29 May 2012) · English: Jem Duducu, "Mehmed II: Ottoman Caesar", All About History, 89 (2013) p. 75