Apart from its historical significance, equivalent to the Western domestication of wheat and barley - which marked the beginning of civilization in general; rice also appeared in legends. It was employed by Hung King's eighteenth son (more Vietnam's Early History) in his invention of banh chung (a square-shaped cake consists of glutinous rice, pork and ground green beans) and banh day (a round-shaped cake made of glutinous rice) as offerings for ancestors.