Apocrypha are biblical or related writings not forming part of the accepted canon of scripture, some of which might be of doubtful authorship or authenticity. In Christianity, the word apocryphal was
The apocryphal letter of Sultan Mehmed II to the Pope (Notes et extraits pour servir à l'histoire des croisades au XVe siècle), published by Nicolae Iorga. Series 4: 1453–1476, Paris; Bucharest, 1915, pages 126–127
The contents page in a complete 80 book King James Bible, listing "The Books of the Old Testament", "The Books called Apocrypha", and "The Books of the New Testament".