What year does the first year of AD refer to?

The first year of AD was the Western Han Dynasty in China. According to the chronology of the official branch, the time corresponding to AD 1 year is the year of the heart, and the time corresponding to the chronology of the year number is the first year of the Han Dynasty and the Han Dynasty.

The Western Han Dynasty was a unified dynasty in the history of China, which lasted for 12 emperor and enjoyed the country for 2 10 years, that is, from 202 BC to 8 AD. It is also known as the pre-Han Dynasty and the Eastern Han Dynasty. At the end of Qin dynasty, the world rose up. After the battle between Chu and Han, Liu Bang defeated Xiang Yu. In 202 BC, Liu Bang proclaimed himself emperor in Dingtao, Shandong Province, and established the Western Han Dynasty, with Chang 'an as its capital.

Brief introduction of other situations in the western han dynasty.

During the Western Han Dynasty, Wushu flourished, its territory expanded on a large scale, and the national prestige of the Han family was far-reaching. In the second year of yuanshuo, Wei Qing was sent to attack the Huns in the north, to recover the land in Henan, and to set up North County and Wuyuan County.

In the second year of Yuanshou, Huo Qubing was sent out of Gansu by the Han Dynasty, and the Xiongnu tribe living in Hexi Corridor was destroyed by right. Wuwei County and Jiuquan County were established here, and then Zhangye County and Dunhuang County were divided. In the sixth year of Ding Yuan, Nanyue was conquered and occupied Hainan Island, and nine counties including Nanhai, Cangwu, Yulin, Hepu, Jiaodian, Jiuzhen, Rinan, Judy and Yueer were established in Hainan Island, and five counties including Wudu, Zhang Ke, Yue Tuo, Li Shen and Wenshan were established in Pingnan.