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Ahura Mazda, also known as Horomazes, is the creator deity and god of the sky in the ancient Iranian religion Zoroastrianism. He is the first and most frequently invoked spirit in the Yasna. The literal meaning of the word Ahura is "lord", and that of Mazda is "wisdom". The first notable invocation of Ahura Mazda occurred during the Achaemenid period with the Behistun Inscription of Darius the Great. Until the reign of Artaxerxes II, Ahura Mazda was worshipped and invoked alone in all extant royal inscriptions. With Artaxerxes II, Ahura Mazda was gathered in a triad with Mithra and Anahita. In the Achaemenid period, there are no known representations of Ahura Mazda at the royal court other than the custom for every emperor to have an empty chariot drawn by white horses to invite Ahura Mazda to accompany the Persian army on battles. Images of Ahura Mazda, however, were present from the 5th century BC but were stopped and replaced with stone-carved figures in the Sassanid period and later removed altogether through an iconoclastic movement supported by the Sassanid dynasty.