Fosterage was a central feature of medieval Irish society, yet the widespread practice of sending children to another family to be cared for until they reached adulthood is a surprisingly neglected topic. Where it has been discussed, fosterage is usually conceptualised and treated as a purely legal institution. This work seeks to outline the emotional impact of growing up within another family. What emerges is a complex picture of deeply felt emotional ties binding the foster family together. These emotions are unique to the social practice of fosterage, and we see the language and feelings originating within the foster family being used to describe other relationships such as those in the monastery or between humans and animals. This book argues that the more we understand how people felt in fosterage, the more we understand medieval Ireland.

*Sacred Sisters* focuses on five saints: the four female Irish saints who have extant medieval biographies (Darerca, Brigid, Íte, and Samthann), and Patrick, whose writings -- fifth-century Ireland’s sole surviving texts -- attest to the centrality of women in Irish Christianity’s development. Women served as leaders and teachers, perhaps even as bishops and priests, and men and women worked together in a variety of arrangements as well as independently. Previous studies of gender in medieval Ireland have emphasized sexism and sex-segregated celibacy, dismissing abundant evidence of alternative approaches throughout the sources, including in the Lives of Ireland’s female saints. Sacred Sisters places these generally marginalized texts at its center, exploring their portraits of empowered, authoritative, compassionate women who exemplified an accepting and affirming ethics of gender and sexuality that would be unusual in many mainstream Christian movements in the present day, let alone in the Middle Ages.