A strange and relatively little known event in Middle Ages history is that which is called "the children's crusade". According to many historians, this event took place in reality, even though there are voices pleading for myth or legend. There are many sources with complex information, not always convergent, and, for this reason, it is useful to look deeper in the area of historiography in order to configure the necessary frame in the process of analysing an impressive number of fictional texts. The products of this process of fictionalisation have been spread geographically in an interesting manner, and in different artistic forms: fiction, visual arts, music, film, etc., addressing to many generations of receivers as well as to different tastes and preoccupations, sometimes in a commercial way. Approaching as many fictional products generated by the above mentioned nucleus will help us understand the way this historical fact turned to metaphor.