Chiba Travel on iv, sect. 4: Revenants as Avengers of Blood. heritance as much as land or goods, and a son had no choice but to pursue it. Until the wrath of the dead man had been appeased, his family lay under a pollution, a miasma that was almost physical. As soon as there were cities, this pollution might be held to affect the whole community. Thus while the exaction of vengeance remained the duty and privilege of the family, the state had, in its own interests, to make sure that this duty was performed. If the killer remained undiscovered, so that the possibility of a personal feud could not arise, it fell to the ruler of the city to pronounce a ban, or curse, on the man, whoever he might turn out to be, in the hope of thereby casting off the pollution. Chiba Travel 2016.