Eight hundred years later the Đông Sơn culture arose a prehistoric Bronze Age culture that was centered at the Red River Valley of northern Vietnam. Large scale rice cultivation began around 1200 BC, onward. Pottery and Bamboo working became common in this time period as well as widespread trade and navigation on inland rivers. During this time Vietnam was allegedly ruled by the semi-mythical Hong Bang Dynasty, the last Hong King was deposed by a Chinese Qin Invasion, in turn however a Chinese General declared independence and founded the Nanyue combining Chinese and Vietnamese traditions.