A key issue in criminology is to account for variation in rates of violence across time and place. An important variable largely neglected in the literature is individualism. Building on theoretical ideas proposed by Durkheim, Black, and Baumgartner, we illustrate the role of increased individualism with a case study: the decline of homicide in England, 1250–1750. The qualitative historical materials we present reveal the growth of more individualized conflicts evident in less third-party partisan intervention and a reduced concern with honor. More individualized conflicts were, in turn, a product of a more individualized society, one characterized by increased social distance and mobility. As conflicts individualized they became less lethal, resulting in declining aggregate rates of homicide. Although the case study is historical, our argument has implications for understanding contemporary criminal violence. • The individualization of society helps to explain the steep decline in English homicide rates, 1250–1750. • A more individualized society tends to produce more individualized – and less violent – conflicts. • Individualized conflicts are characterized by fewer clashes between groups and fewer clashes about honor. • The degree to which conflicts are individualized can help to explain variation in contemporary rates of violence. [ABSTRACT FROM AUTHOR]