Kaiyuan reign
Kaiyuan Tongbao is a copper currency minted in the Tang Dynasty, and coins began to have "Tongbao" in the Tang Dynasty. In the early Tang Dynasty, the Sui Five Zhu system was used, which was light and confusing. In the fourth year of Wude reign of Emperor Gaozu of Tang Dynasty (621 AD), in order to rectify the chaotic currency system, Sui coins were abolished and the "Kaiyuan Tongbao" was minted, following the strict regulations of the Western Han Wuzhu, replacing the remaining Wuzhu in society.
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