 The Dhammayazika and the Ngamyethna Pagoda are examples of the pentagonal design.The kingdom of Pagan, the "charter polity" of Burma, had a lasting impact on Burmese history and the history of mainland Southeast Asia.The success and longevity of Pagan's dominance over the Irrawaddy valley enabled the ascent of Burmese language and culture, and the spread of Burman ethnicity in Upper Burma and laid the foundation for their continued spread elsewhere in later centuries.