Islam occurred and arrived in Iran about 1400 years ago. it spread in all cities and districts, and due to the attention of Iranians to this new religion, Islamic elements developed greatly. The attention of Iranians to Islam in different cities caused the migration of the descendants of Shiite Leaders(Imam) to Iran. Differents cities of Iran hosted them according to their political and geographical location. The city of Kashan hosted more of these descendants of Shiite Imam. Their presence in Iran and their religious prestige among the people led to the emergence of a special type of Iranian-Islamic architecture that is quite evident in religious shrines. This type of architecture is a beautiful and artistic combination of different types of decorative arts. So you can see a collection of the most beautiful arts of plastering, mirror work, brickwork, inlay, Muqarnas and metal arts in these holy places. Kashan, along with the Iranian cities and capitals, is one of the most important civilizational, cultural and scientific centers of the country, which reached its peak in the Safavid period, and the name of Dar al-Momenin, which the Safavid kings gave to the city.
The magnificent holy shrine of Sultan Ali, the son of the fifth Shiite Imam, built with its Seljuk era tomb is 40 km west of Kashan, where every year on the Friday of the second week of Mehr ( late September ) , a carpet is washed (Ghali-shoyan ceremony) in the memory of his assassination, 12 centuries ago at the same place, called Ardehal karbala.