In What Nostalgia Was, historian Thomas Dodman traces the history of clinical "nostalgia" from when it was first coined in 1688 to describe deadly homesickness until the late nineteenth century, when it morphed into the benign yearning for a lost past we are all familiar with today. Dodman explores how people, both doctors and sufferers, understood nostalgia in late seventeenth-century Swiss cantons (where the first cases were reported) to the Napoleonic wars and to the French colonization of North Africa in the latter 1800s. A work of transnational scope over the longue duree, the book is an intellectual biography of a "transient mental illness" that was successively reframed according to prevailing notions of medicine, romanticism, and climatic and racial determinism. At the same time, Dodman adopts an ethnographic sensitivity to understand the everyday experience of living with nostalgia. In so doing, he explains why nostalgia was such a compelling diagnosis for war neuroses and generalized socioemotional disembeddedness at the dawn of the capitalist era and how it can be understood as a powerful bellwether of the psychological effects of living in the modern age.