Before the beginning of the final siege of Constantinople, Mehmed II made an offer to Constantine XI Palaiologos,the last Byzantine Emperor.
In exchange for the surrender of Constantinople, the emperor's life would be spared to which,he replied:
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.
He died on the day the city fell.
His last recorded words were: "The city is fallen and I am still alive", and then he tore off his imperial clothes so as to let nothing to distinguish him from any other soldier and led his remaining soldiers into a last charge where he was killed.