Hatto II's cruelty is a thing of legend. At a time of a famine in 913, Hatto was besieged by the poor and oppressed who asked him to release some of the grain stored in the archiepiscopal granaries. Hatto assembled his petitioners in a large barn in Caub, Germany with the pretext of feeding them -- and promptly set it on fire, burning everyone to death.
Hatto then retired to a fortified tower in the middle of the Rhine, thinking himself safe from retribution. According to legend, a great army of mice swam across the river, gnawed their way into the tower, and ate Bishop Hatto alive.