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Islam came to Iran slowly and the nobility and city-dwellers were first to convert. By the 10th century most of Iran had converted to Islam.

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The Shia Islamic people celebrate two feasts, the Feast of the Sacrifice and the Feast of Breaking the Fast. The Feast of the Sacrifice ends with ritual celebrations of the hajj pilgrimage. The Feast of Breaking the Fast is the feast after the month long fast of Ramadan.

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Afray, Janet. “Iran.” Encyclopædia Britannica, Encyclopædia Britannica, Inc., www.britannica.com/place/Iran/Government-and-society.

Cosman, Madeleine Pelner. “Holidays and Festivals in the Middle Ages.” Infobase, online.infobase.com/HRC/Search/Details/22?articleId=239814&q=shia%20celebrations.

Editors of Encyclopedia Britannica. “Masjed-e Emām.” Encyclopedia Britannica, 22 June 2021, www.britannica.com/topic/Masjed-e-Emam.

Rasaneh, Sirang. “Imam Mosque (Shah Mosque) 2021 Tourist Attraction in ISFAHAN, Travel TO IRAN, Visit Iran.” Itto.org | Iran Tourism & Touring, www.itto.org/iran/attraction/shah-mosque-isfahan/.

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About 99.4% of the population believe in Islam.

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The Shah Mosque was built in the Safavid era under Shah Abbas, the Safavid King. It began construction in 1611 and was completed around 1630. In 1638 marble dadoes were added.

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The Shah Mosque is used by the Shia Islam's. About 90% of Iranian Muslims associate with the Shia Branch of Islam.

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Iran is a unitary Islamic Republic with one legislative house.

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The main language of Isfahan, Iran is Persian.

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The Shah Mosque is located in Isfahan, Iran.