In which dynasty did Tomb-Sweeping Day begin? What does it have to do with the Cold Food Festival? Thank you for your answers.

The traditional Tomb-Sweeping Day in China began in the Zhou Dynasty and has a history of more than 2,500 years.

In ancient China, before Tomb-Sweeping Day, there was an important festival related to Tomb-Sweeping Day-Cold Food Festival. The cold food is on the day after tomorrow 105, the cold food lasts for 3 days, and then it is Qingming, so Tomb-Sweeping Day is on the day after tomorrow 108. The modern Cold Food Festival has basically been merged into Tomb-Sweeping Day, but there are still differences between the two. The 105th to the 15th day after beginning of winter was called the Cold Food Festival. In the past, it was forbidden to light a fire and serve cold food, so it was also called the Cold Food Festival and the No-smoking Festival. According to folklore, cold food is to commemorate the burning of mesons in Mianshan during the Spring and Autumn Period, and Jin Wengong ordered the fire to be banned. Jiezitui is from Shanxi, so the custom of cold food is first popular in Shanxi. In ancient times, cold food cut off fire. The next day, a ceremony was held in the palace to drill wood for fire. People also begged each other to make a fire with wicker. Cold Food Festival and Tomb-Sweeping Day are two different festivals. In the Tang Dynasty, the day of sweeping graves was designated as the Cold Food Festival.