Termerus

Termerus was a figure from Greek mythology and a criminal who became an enemy of Heracles - he is what the term "Termerian mischief" comes from in the modern world.

History
Termerus was a bandit who roamed ancient Greece and often ambushed, robbed and murdered any that got in his path, described as a wild and barbaric man his life was typical of a nomadic robber in the ancient world - taking advantage of travellers and resorting to murder and terror at the slightest whim to achieve his goals.

Termerus was apparently fond of killing his victims by "running his head against them" (in other words, headbutting them to death) - this would serve as a deadly punishment when he made the ill-fated decision to antagonize Heracles, who proceeded to shatter Termerus' skull into pieces - thus killing the barbarian in the same manner he had killed many innocents before.