As to why the Dragon God has to content himself with a place underneath the altar, the legend is that emperor Zhu Yuanzhang of the Ming dynasty was traveling incognito among the people on one occasion, and stopped for refreshment at a busy inn. Since he couldn't find a proper place he sat down at the table used for making offerings to Earth Lord, first removing the icon and putting him on the ground.
至於這龍神為何要屈於案下，傳說是明太祖朱元璋微服出巡時，來到一座客棧吃酒，因為客滿找不到桌子，於是將土地公暫放地上，拿了供桌當飯桌。