Ardumaniš was one of the seven conspirators who killed the Magian usurper Gaumâta and helped Darius I the Great become king (September 522 BCE).

Ardumaniš is the only conspirator not mentioned in the third book of the Histories by the Greek researcher Herodotus, in which he describes Darius' coup d'état. We know his name only from the famous Behistun inscription; he remains otherwise unknown.