What are the ancient civilization etiquette stories that have become idioms?

Warm Seats in Huang Xiang is a story about filial piety, which originated from the story of Gan Bao's search for gods. It tells the story of Xiang fishing for his stepmother in winter and is regarded as a classic story of filial piety by later generations. Apollo's crying stick refers to filial piety to his parents. With it, Apollo's mother cried. His mother said,' He didn't cry when he died. Why is he crying now?' Yes, he said, I feel pain when I offend. This mother's strength can't create pain, but I cried. [2] Item "Talking about Yuan Jianben" Kong Rong Jean Pear is the true story of Kong Rong, a writer in the late Eastern Han Dynasty in China, who taught people to be modest in everything. "three words" ...