Ancient Jame Mosque of Qazvin is one of the oldest mosques in Iran, and is the grand, congregational mosque (Jameh Mosque) in Qazvin Province, Iran.
The oldest part of the mosque is said to have been constructed by the orders of Harun al-Rashid in 807 CE Later additions were made, the last being during the late Safavid era.
The double layered main dome of the mosque is from the Seljuq era, and is locked to the public. It houses some precious examples of relief calligraphy from medieval times. Renovations have also been carried out on many sections of the mosque. The foundation of the mosque is laid on a Zoroastrian fire temple.
In spite of Mongol invasion, the mosque still stands today in its full glory and It is in use. Parts of the mosque have been turned into a public library. The mosque also contains a Shabestan and Ab anbar, both now under the protection of Iran’s Cultural Heritage Organization. Part of the mosque got on fire January 28 2013 and that resulted in the historic tomb to be completely destroyed.