Who was the first grave sweeper in Tomb-Sweeping Day?

The first grave sweeper was Jin Wengong.

Jin Wengong (67 BC1or 697-628), surnamed, was the 22nd monarch of Jin State in the Spring and Autumn Period of China, and his reign lasted from 636 BC to 628 BC. He is my son and his mother is Fox Ji. Jin Wengong was the second overlord among the five tyrants in the Spring and Autumn Period, and he was also called "Qi Huan Jinwen" with Qi Huangong.

When Jin Wengong was exiled, he was often hungry and naked. One year, Jin Wengong almost starved to death. Meson pushed a piece of meat on his leg and cooked it with wild vegetables to give him soup. When eating, I was greatly moved to know that mesons pushed the meat on my legs. When Jin Wengong returned to China as a monarch and vassal, he forgot Jiezitui, who didn't want to cry roast meat and compete for favor, and lived in seclusion with his mother in Mianshan. Later, Jin Wengong personally invited meson Tui to Mianshan, but meson Tui didn't want to come out. People in Jin Wengong released Yamakaji and forced mesons to show up. As a result, meson pushed his mother and was burned to death under a big willow tree.

In memory of this loyal minister, Jin Wengong ordered Jiexiu not to cook with fire on the day of his death, but to eat cold food, which is called Cold Food Festival. The following year, Jin Wengong led ministers to climb mountains to pay homage. When he discovered that the old willow tree had come back from the dead, he gave it the title of "Qingming Willow" and told the world that the day after the Cold Food Festival was designated as Tomb-Sweeping Day.