In “Was the Pied Piper of Hamelin a child molester?” ( http://www.straightdope.com/mailbag/mpiedpiper.html ) Eutychus of the SDSAB concludes, “Like most legends, the Pied Piper story most likely has its origin in something more prosaic than fantastic. But the fantastic does make a much better fairy tale.”
Perhaps so. But no discussion of the Pied Piper would be complete without a mention of rather extraordinary story of The Children’s Crusade of 1212.
One of many puzzles confronting medieval theorists was why Christian troops were not more successful in reclaiming the Holy Lands, given that G-d was surely on their side. A French peasant boy of 12 years named Stephen thought he had the answer: Christ had said that unless people became children, they could not enter the Kingdom of Heaven. Clearly, previous Crusaders had been insufficiently pure. One need only bring a crowd of children to the shores of Europe and the seas would split open with the young Crusaders teleported to the Holy Lands forthwith.
Stephen gathered perhaps ten or thirty thousand young followers. After enduring much hardship and a few deaths, they found their way to Marseilles and were profoundly disappointed when no miracle ensued. Many wandered away at this point. The remainder hunkered down, until two merchants generously provided seven ships to sail them free of charge to the Holy Land.
Eighteen years later, a priest appeared in France with an interesting story. He claimed to be one of the children who had set sail from Marseilles. Of the seven ships, two had been lost at sea; the remaining five had been diverted to Algeria. Their human cargo was then sold into slavery. (Some were sold in Egypt and Bagdhad, where they fetched better prices.)
A boy named Nicholas led a similar expedition from Germany. That group endured much hardship and death, but was lucky enough (I suppose) not to have successfully crossed the Mediterranean.
The author of The Sword and the Scimitar (1974) speculates that this whole sorry episode may have given rise to the legend of the Pied Piper of Hamelin. Ok, so it’s speculation. And the Hamelin variant supposedly occurred around 1284 - 72 years later. Still, one can’t help but notice the thematic parallels.