This chapter introduces the history of manners in Thailand, linking it to the sociological concept of habitus or 'second nature': how historical experience leaves its imprint on the way people speak, act, and think. It surveys the sociological literature about habitus, discussing in particular detail the work of Norbert Elias, including his famous study of the history of manners in Western Europe, The Civilizing Process. The chapter argues that Elias’s concept of a civilizing process may be adapted to the Thai context to better understand how manners in Thailand have evolved. It proposes that the history of manners in Thailand may be divided into four periods: the age of colonialism and absolutism (the second half of the nineteenth century); the age of revolution (the first half of the twentieth century); the age of reaction (the post-World War II period); and the age of democracy and development (since roughly the 1970s). The chapter also discusses the related concepts of civility and civilization.