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Tradition dictates that Confucius (551–479 BCE) compiled the "Book of Documents" and included the "Yu Gong", although it is more likely that this was done later. Wang Guowei suggested in his "New Confirmation of Ancient History" (古史新证) that the "Yu Gong" was written at the start of the Zhou Dynasty, but most scholars now agree with the view of Gu Jiegang that it is a product of the Warring States, Qin or Early Han periods.