The history of Bukhara stretches back for millennia. The origin of its inhabitants goes back to the period of Aryan immigration into the region. The city itself, currently the capital of the Bukhara Region (viloyat) of Uzbekistan, is about two and a half thousand years old. Located on the Silk Road, the city has long been a centre of trade, scholarship, culture, and religion. During the Golden age of Islam, under the rule of Samanids, Bukhara became the intellectual centre of the Islamic world. In medieval times, Bukhara served as the capital of the Khanate of Bukhara and was the birthplace of Imam Bukhari.