These are actual names for past rulers whose names became discriptive disparaging monikers:

Charles the Simple, Son of Louis the Stammerer. So called for his policy of making concessions to the Norse invaders rather than fighting.

Louis the Sluggard (or the "Do-Nothing"), was noted for his self-indulgence, he ruled from 986 to 987 over the Franks.

Ethelred the unready (968-1016) so called because of his inability to repel the Danish invasion of England. At first he paid tribute to the Danes, but their raids continued and he was forced to abandon England for Normandy in 1013. Those who are more generous call him Ethelred the ill-advised.

Louis the Fat, like his father, was obese. At the age of 47 because of his extreme corpulence, he was unable to mount his horse.