Tang dynasty.In 621, the 4th year of Tang Emperor Wude, "Kal Yuan Tong Bao" coins were formally issued and the former "Wu Zhu" coin system was abolished. As the major currency of the Tang dynasty, each "Kai Yuan Tong Bao" coin weighed one-tenth Liang (tael, each tael then equals 42 gram), which began the decimal system in ancient China. "Tong Bao" and "Yuan Bao" were the names of money.

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