The ancient Hamadan city is the center of Hamadan province. Founding of this city has been attributed to Deioces, the Median king and it is the first imperial capital of Iran (of the Median Empire). Hamadan is considered to be the oldest city of Iran and one of the oldest cities in the world. This city has ancient history and culture and has been the home of many famous scientists, scholars and mystics. Hamadan city has been of immense importance during different periods of Iran’s ancient history as the capital of many of its ruling governments. This city has become sister city with some other cities in the world, among which Kulob in Tajikistan, Sparta in Turkey, Bukhara in Uzbekistan and Yekaterinburg in Russia can be named. The reason why Hamadan and Kulob cities have become sisters is because of the tomb of the mystic and sufi, Mir Sayyid Ali Hamadani, who was born in Hamadan and buried in Kulob. Also, since Avicenna was born and raised in Bukhara, the sisterhood of these two cities has special significance.