Kermanshah, Capital of Kermanshah province also known as Bakhtaran is an important region in Iran and holds some of the most exotic and famous archaeological sites and historical ,cultural attractions in western part of the Province, it is located 525 kilometres (326 miles) from Tehran in the western part of Iran. According to the 2011 census, its population is 851,405. As Kermanshah is the largest Kurdish-speaking city in Iran,People mostly speak Southern Kurdish but Farsi is spoken with a pleasant Kermanshahi accent too, also in other parts of the province Kurdish is spoken in diversified accents. Kermanshah has a moderate and mountainous climate. Majority of people in Kermanshah are Shia Muslims, and there are minorities such as Sunni Muslims, Yarsanism and so on.
In ancient Iranian mythology, construction of the city is attributed to Tahmuras, the third king of Pishdadian dynasty. It is believed that the Sassanids have constructed Kermanshah and Bahram IV (he was called Kermanshah, meaning king of Kerman) gave his name to this city. It was a glorious city in Sassanid period about the 4th century AD when it became the capital city of Persian Empire and a significant health center serving as the summer resort for Sassanid kings.