The Chivalric Turn examines the medieval obsession with defining and practising superior conduct, and the social consequences that followed from it. Historians since the seventeenth century have tended to understand medieval conduct through the eyes of the writers of the Enlightenment, viewing superior conduct as ‘knightly’ behaviour, and categorising it as chivalry.Using, for the first time, the full range of the considerable twelfth- and thirteenth-century literature on conduct in the European vernaculars and in Latin, The Chivalric Turn describes and defines what superior lay conduct was in European society before chivalry, and maps how and why chivalry emerged and redefined superior conduct in the last generation of the twelfth century. The emergence of chivalry was only one part of a major social change, because it changed how people understood the concept of nobility, which had consequences for the medieval understanding of gender, social class, violence, and the limits of law.