Specifically, a monarch, or other ruler or master, who uses
   power to oppress his subjects; a person who exercises unlawful
   authority, or lawful authority in an unlawful manner; one who by
   taxation, injustice, or cruel punishment, or the demand of unreasonable
   services, imposes burdens and hardships on those under his control,
   which law and humanity do not authorize, or which the purposes of
   government do not require; a cruel master; an oppressor.