This book presents a new approach to early English theatre by exposing a genuine relationship between monastic performances and theatricality. It argues that modern theatre was reinvented in Anglo-Saxon monasteries by monks who were required to transform themselves by disciplining their bodies and performing complex religious acts. After extensively surveying the monastic and liturgical sources of theatre the author reconstructs the XII-century staging of the Anglo-Norman Ordo representacionis Ade and demonstrates the fundamental incongruity between the ancient and Christian performativity. On a more personal note he concludes with comments on references to the monastic rule in Performer , a programmatic text by Jerzy Grotowski.