Ахура Мазда
Whether the Achaemenids were Zoroastrians is a matter of much debate. However, it is known that the Achaemenids were worshipers of Ahura Mazda. The representation and invocation of Ahura Mazda can be seen on royal inscriptions written by Achaemenid kings. The most notable of all the inscriptions is the Behistun Inscription written by Darius I which contains many references to Ahura Mazda. An inscription written in Greek was found in a late Achaemenid temple at Persepolis which invoked Ahura Mazda and two other deities, Mithra and Anahita.