Here's links to descriptions of the Blood Passover Saints mentioned in this song:
https://en.m.wikipedia.org/wiki/Simon_of_Trent
https://en.m.wikipedia.org/wiki/Little_Saint_Hugh_of_Lincoln
https://en.wikipedia.org/wiki/William_of_Norwich
https://en.wikipedia.org/wiki/Andreas_Oxner
https://en.wikipedia.org/wiki/Harold_of_Gloucester
https://en.wikipedia.org/wiki/Dominguito_del_Val
https://en.wikipedia.org/wiki/Robert_of_Bury
https://en.wikipedia.org/wiki/Werner_of_Oberwesel
https://en.wikipedia.org/wiki/Holy_Child_of_La_Guardia
https://en.m.wikipedia.org/wiki/Simon_of_Trent
https://en.m.wikipedia.org/wiki/Little_Saint_Hugh_of_Lincoln
https://en.wikipedia.org/wiki/William_of_Norwich
https://en.wikipedia.org/wiki/Andreas_Oxner
https://en.wikipedia.org/wiki/Harold_of_Gloucester
https://en.wikipedia.org/wiki/Dominguito_del_Val
https://en.wikipedia.org/wiki/Robert_of_Bury
https://en.wikipedia.org/wiki/Werner_of_Oberwesel
https://en.wikipedia.org/wiki/Holy_Child_of_La_Guardia
They were just little kids turned to bread by the yiiiiiiiids!