Not much is known about this first Chinese dynasty -- in fact, it until fairly recently, most historians thought that it was a myth. But the archeological record has proven them wrong, for the most part. What little is known indicates that the Xia had descended from a wide-spread Yellow River valley Neolithic culture known as the Longshan culture, famous for their black-lacquered pottery. Even though no known examples of Xia-era writing survive, they almost certainly had a writing system that was a precursor of the Shang dynasty's "oracle bones."