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In 1115, near the city of Magdeburg, on the day prior to Passover, Hasidic Jews tortured five children and used their blood in occult rites.... The incident was investigated, and Jews were found guilty and punished accordingly.

Up till that time, many of these incidents were probably forgotten.  It seems likely that most historical records regarding these incidents would be lost over time. 

In 1144, an incident occurred to a child in England.  Jews were not permitted in England until about 50 years prior to then, in 1089, and were just brought there to assist the king with collecting his taxes.  Anyway, a child by the name of William was ritually murdered.  But what made this event different was that the child was related to an educated monk, Thomas of Monmouth. 

This event that occurred to William, like so many before it, would have eventually sunk into obscurity, but Thomas wanted to let the whole world know about the cruel and vicious nature of these wicked acts once and for all, probably with the hope of putting a stop to them.  His book was written in Latin, and was later translated into English in the 19^th century by Dr. A. Jessop.  Thomas of Monmouth described how Jews abducted the child.  Afterwards, according to Thomas, this occurred: