Storiche dei Monarchi Ottomani.
It is entirely upon the authority of these four writers that the Pope is charged with having poisoned Djem, and it is noteworthy that in the four narratives we find different dates and three different places given as the date and place of the Turk's death, and more noteworthy still that in not one instance of these four is date or place correctly stated.
Now the place where Djem died, and the date of his death, were public facts about which there was no mystery; they were to be ascertained--as they are still--by any painstaking examiner.

His poisoning, on the other hand, was admittedly a secret matter, the truth of which it was impossible to ascertain with utter and complete finality.

Yet of this poisoning they know all the secrets, these four nimble writers who cannot correctly tell us where or when the man died! We will turn from the fictions they have left us--which, alas! have but too often been preferred by subsequent writers to the true facts which lay just as ready to their hands, but of course were less sensational--and we will consider instead the evidence of those contemporaries who do, at least, know the time and place of Djem's decease.
If any living man might have known of a secret poison of the Borgias at this stage, that man was Burchard the Caeremoniarius, and, had he known of it, not for a moment would he have been silent on the point.

Yet not a word of this secret poison shall you find in his diaries, and concerning the death of Djem he records that "on February 25 died at the Castle of Capua the said Djem, through meat or drink that disagreed with him." Panvinio, who, being a Neapolitan, was not likely to be any too friendly to the Pope--as, indeed, he proves again and again--tells us positively that Djem died of dysentry at Capua.( 1) 1 Vitis Pontif.

Rom.
Sanuto, writing to the Council of Ten, says that Djem took ill at Capua of a catarrh, which "descended to his stomach"; and that so he died.
And now mark Sanuto's reasoning upon his death, which is the very reasoning we should ourselves employ finally to dispose of this chatter of poisoning, did we not find it awaiting quotation, more authoritative therefore than it could be from us, and utterly irrefutable and conclusive in its logic.