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In page Harem:

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There is no evidence among early Iranians of harem practices, that is, taking large numbers of wives or concubines and keeping them in seclusion.[citation needed] However, Iranian dynasties are said to have adopted harem practices after their conquests in the Middle East, where such practices were used in some cultures such as Assyria (the Median Empire conquered Assyria in the 7th century BC, and Media transformed into the Achaemenid Empire).[1] According to Greek sources, the nobility of the Medes kept no less than five wives, who were watched over by eunuchs.[1]