In 770 B.C., when the Emperor, having moved his capital to the east, ceded his ancestral lands in the west to Ts'in on condition that Ts'in should recover them permanently from the Tartars, the document of cession was engraved upon a metal vase. Fifteen hundred years before this, the Nine Tripods of the founder of the Hia dynasty, representing tributes of metal brought to the Emperor by outlying tribes, were inscribed with records of the various productions of China: these tripods were ever afterwards regarded as an attribute of imperial authority; and even Ts'u, when it began to presume upon the Chou Emperor's weakness, put in a claim (probably based upon his ancestors' own ancient Chinese descent, as explained in Chapter IV.) to possess them. In distributing the fiefs amongst relatives and friends, the first Chou emperors "composed orders" conferring rights upon their new vassals; but it is not stated what written form these orders took. Written prayers for the recovery of the first Emperor's health are mentioned, but here again we are ignorant of the material on which the prayers were written by the precentor. Four hundred years later, in 65, when Ts'in had assisted to the throne his neighbour the Marquess of Tsin, the latter gave a promise in writing to Ts'in that he would cede to her all the territory lying to the west of the Yellow River. The next ruler of Tsin, the celebrated wanderer who afterwards became the second Protector, is distinctly stated to have had an adviser who taught him to read; it is added that the same marquess also consulted this adviser about a suitable teacher for his son and heir. About the same time one of the Marquess's friends, objecting to take office, took to flight: his friends, as a protest, hung up "a writing" at the palace gate. In 584 a Ts'u refugee in Tsin sends a writing to the leading general of Ts'u, threatening to be a thorn in his side. It is presumed that in all these cases the writing was on wood. The text of a declaration of war against Ts'u by Ts'in in 313 B.C., at a time when these two powers had ceased to be allies, and were competing for empire, refers to an agreement made three centuries earlier between the King of Ts'u and the Earl of Ts'in; this declaration was carved upon several stone tablets; but it does not appear upon what material the older agreement was carved. In 538, at a durbar held by Ts'u, Hiang Suh, the learned man of Sung, who has already been mentioned in Chapter XV. as the inventor of Peace Conferences in 546, and as one of the Confucian group of friends, remarked: "What I know of the diplomatic forms to be observed is only obtained from books." A few years later, when the population of one of the small orthodox Chinese states was moved for political convenience by Ts'u away to another district, they were allowed to take with them "their maps, cadastral survey, and census records."