What's with the year names used in ancient times?

In ancient times, the year number used to count years referred to the year number formulated by the ruler to indicate the beginning of a certain period or event. These year titles were usually formed by the names of famous people or authoritative figures to show respect and commemorate. For example, in the Spring and Autumn Period of China, from 770 to 476 B.C., the historical period usually used terms such as the Spring and Autumn Period or one of the Spring and Autumn Period. The Warring States Period, from 475 B.C. to 221 B.C., used the terms Warring States Period or one of the Warring States Period. The year names used in ancient times were also widely used in various countries. For example, the fall of the Roman Empire was in 476 B.C., which was also known as the year of the fall of the Roman Empire. The year title was an important vocabulary used in ancient times to indicate the beginning of a certain period or event. It not only helped people better understand and record history, but also provided important clues and evidence for later researchers.