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Dau Pagoda, also known as Dien Ung, is situated in Dau, Thuan Thanh District, Bac Ninh Province. Built in the 3rd century, Dau Pagoda is the oldest pagoda in Vietnam. In the beginning, the pagoda was a Buddhist center well known throughout the country and abroad. At the end of the 4th century, Ch’an Master Vinitaruci gave lectures and the first Vietnamese Buddhist doctrine was produced there.