Ancient city, Media. It was formerly one of the great cities of Iran; its ruins are at modern Rey, near Tehrān. Settlement there dates from the 3rd millennium BC. Under the Sāsānian dynasty (3rd–7th century AD), it was a centre of Zoroastrianism. Captured by the Muslims in AD 641, it grew in importance until the 12th century, when it was weakened by religious conflicts. In 1220 it was destroyed by the Mongols, and its inhabitants were massacred. It was famous for its decorated silks and for ceramics. The aynAbbāsid caliph Hārūn al-Rashīd, memorialized in
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