The Congregational Mosque of Ardestan is one of the most beautiful and best-preserved Iranian mosques. Vestiges of four historical epochs are discernible here. The earliest belong to a Sasanid fire temple, remodeled to meet the needs of a Muslim religious building. This primeval mosque, which consisted of a single domed sanctuary, was built in the 10th century
by Omar ibn Abdelaziz, a governor of Esfahan. During the late 10th and l1th centuries, it was reconstructed and executed on the “kiosk” plan. By the Seljuk period, the mosque was destroyed and rebuilt on a new, four-eivan type of the floorplan used for the first time in neighboring Zavareh.