Abstract

The Tristan legend is the quintessential love story of the Middle Ages. From the formative period of its courtly branch, the only extant complete version is Tristrams saga ok Ísöndar (1226). King Hákon of Norway commissioned this and other romances to convince his aristocratic warriors to give up the kinship society ethos of heroic love that directed them to rape their enemies’ women. Courtly love sacralized female consent, yet critics have struggled to make sense of which purposes courtliness served. This evolutionary reading of Tristrams saga reveals how courtly love not only functioned as an ideological bridge be­tween mating regimes, but also embodied proto-WEIRD psychology, the impersonal pro­sociality of the new mobile, educated, and transculturally inclusive European individual-as described by Henrich (2020). This ethos would evolve to become the morality of modernity. How it was disseminated exemplifies how fiction can help communities find provisional solutions to problems that cannot be solved definitely.