The Introduction offers a brief overview of Paul Slack’s contribution to early modern history, distinguishing between an earlier phase concerned with social policy and the ideas which informed it, and a later phase concerned with the history of political economy, and particularly the shifting discourse of happiness which, he argued, informed it. It then explores recent interest in the history of emotions, distinguishing a variety of approaches to that subject. Reviewing three broad approaches taken by the contributors to the volume, it goes on to suggest that the history of emotions is most stimulating when seen as a focal point for different kinds of history rather than as a discrete subject of enquiry. A further implication is that a variety of forms of expertise need to be brought to bear.