Pagan (now Bagan) is an ancient city located in the Mandalay Region of Burma (Myanmar). From the 9th to 13th centuries, the city was the capital of the Kingdom of Pagan, the first kingdom to unify the regions that would later constitute modern Myanmar. Between the 11th and 13th centuries, over 10,000 Buddhist temples, pagodas and monasteries were constructed in the Bagan plains alone, of which the remains of over 2200 temples and pagodas still survive to the present day. Pagan's 250-year rule over the Irrawaddy valley and its periphery laid the foundation for the ascent of Burmese language and culture, the spread of Burman ethnicity in Upper Burma, and the growth of Theravada Buddhism in Burma and in mainland Southeast Asia.