The Daevas were a class of demons in Zoroastrianism that chose to follow Angra Mainya.
Zoroastrianism is a belief system - likely founded around the 6th century BCE - based on the teachings of the prophet Zoroaster. Zoroastrianism is a dualistic religion with an all good creator, Ahura Mazda, fighting an endless battle against evil, chaos and destruction led by Angra Mainyu or Ahriman. Read articles about Zoroastrianism below.
In ancient Persian religion (Zoroastrianism), Ahriman (aka Arimanius or Angra Mainya) stood high in the ranks of the enemies who opposed Ahura Mazda (aka Ohrmazd or Oromasdes).