Iran: The Shah Mosque (Persian: مسجد شاه), also known as Imam Mosque (Persian: مسجد امام), renamed after the 1979 Iranian Revolution, and Jaame' Abbasi Mosque, is a mosque in Isfahan, standing in south side of Naghsh-e Jahan Square. Built during the Safavid period, ordered by the first Shah Abbas of Persia. It is registered, along with the Naghsh-e Jahan Square, as a UNESCO World Heritage Site. Its construction began in 1611, and its splendor is in large part due to the beauty of its seven-colour mosaic tiles and calligraphic inscriptions. The mosque is depicted on the reverse of the Iranian 20,000 rial banknote.