Introduction to "Collection of Letters": In 1669, the daughter of the Marchioness of Sevigny married the Count of Grignan. After the marriage, she followed her husband, who was the territorial governor, to the south of France. After Madame Sevigny and her daughter separated, they missed each other and wrote to her daughter (Count Francois de Grignan) in Paris every day for twenty years, telling the luxurious life, anecdotes and human affairs between the Paris court and the nobility. It is passed down from later generations that her only literary work "Lettres" was compiled by her granddaughter. It has been translated into many languages ​​and published and distributed around the world.