In order to rectify the chaotic monetary system and abolish Sui money, the monetary system was reformed with reference to the five-baht standard in the Western Han Dynasty. The casting and circulation of Kaiyuan Bao Tong in the Tang Dynasty promoted the Tang Dynasty, whose capital was Chang 'an, to enter a prosperous period of long-term stability. Because of "baht", Zhenguan Shengshi is called "Golden baht year" because of its wealth. Zhenguan's rule coincided with the Year of the Pig in Dinghai, and the folk spread the "Year of the Golden Pig", which was equivalent to the Year of the Golden Pig. Therefore, the Year of the Fire Pig in Dinghai, which was bound to have auspicious events, was renamed the Year of the Golden Pig in Dinghai.
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The Year of the Golden Pig was originally called the Year of the Fire Pig.
Before the first year of Zhenguan in 627 AD, Dinghai Year was always called the Year of the Fire Pig. The 60-year cycle of Dinghai Year of the Fire Pig was accompanied by prosperity, marked by the birth of Liu Fuling in 94 BC. In A.D. 147, Emperor Huan of the Eastern Han Dynasty ascended the throne; In 207 AD, Liu Bei visited the Caotang, and Zhuge Liang went out of Longzhong. In 567, in the first year of Everbright, Chen Bozong acceded to the throne.
References:
Golden Pig Year _ Baidu Encyclopedia