"the loudest noise was the buzzing of flies over the spilled guts"
Beelzebub as a Fly
Public DomainBeelzebub as a Fly - Credit: Collin de Plancy

When summoned by witches or sorcerers the devil, or Beelzebub, was said to appear in the form of a fly, and thus was known as "The Lord of the Flies."

He may also have got this name as flies were once believed to be generated in the flesh of corpses.