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Zhang Guo Lao was an actual figure from Taoist mythology. He is said to have lived several hundred years, and that he was born toward the end of th 600s, which would put him during the Tang Dynasty. Various emporers invited him to their court, but he always refused. He could go without food for four days by only sipping wine. He is seen riding a magical white mule and his symbol is a Yu Ku, or fish drum, which is made of bamboo.
In Jackie Chan Adventures, Zhang Guo Lao uses his drum to defeat Po Kong, the Mountain Demon.