The Noin-Ula burial site consist of more than 200 large burial mounds, approximately square in plan, some 2 m in height, covering timber burial chambers. They are located by the Selenga River in the hills of northern Mongolia north of Ulaanbaatar in Batsumber sum of Tov Province. They were excavated in 1924–1925 by Pyotr Kozlov, who found them to be the tombs of the aristocracy of the Xiongnu; one is an exceptionally rich burial of a historically known ruler of the Xiongnu, Wuzhuliu, who died in 13 CE. Most of the objects from Noin-Ula are now in the Hermitage Museum in Russia, while some artifacts unearthed later by Mongolian archaeologists are on display in the National Museum of Mongolian History, Ulaanbaatar. Four kurgans contained lacquer cups inscribed with Chinese characters believed to be the names of Chinese craftsmen, and dated from 9th year BCE to 2nd year BCE.