Talk:Apadana

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What is the source for the photographic caption? Last I checked that image's meaning is still under debate. The theory of it being Angra-Mainyu killing the primeval bull sounds accurate enough, but i've been researching and the only myth i have found in which this story occurs appears years after the Apadana's construction. Does anyone have a source in which this Zoroastrian interprentation is presented?