Depredation without authority, or transgression of authority given, by despoiling beyond its warrant. Fixed domain, public revenue, and a certain form of government, are exempt from that character, therefore the Barbary States were not treated by Europe as such. The Court of Admiralty is empowered to grant warrants to commit any person for piracy, only on regular information upon oath. By common law, piracy consists in committing those acts of robbery and depredation upon the high seas, which, if committed on land, would have amounted to felony, and the pirate is deemed hostis humani generis.