City (pop., 2006: 355,338), northwestern Iran. It was founded as Shad Shāhpūr in 250 CE and flourished under Muslim rule in the 7th century. Genghis Khan laid waste to the city, but it later revived and was made the capital of Persia (1548–98) under the Ssubdotafavid dynasty. In the late 18th century it became a base for foreign trade with areas of the Caspian Sea, the Persian Gulf, and Anatolia. A coup was launched from Qazvīn in 1921 that led to Iran's consolidation under Reza Shah Pahlavi. It is a regional communications centre, with some manufacturing.
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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.