Book excerpt: The expression "liturgical drama" was formulated in 1834 as a metaphor and hardened into formal category only later in the nineteenth century. Prior to this invention, the medieval rites and representations that would forge the category were understood as distinct and unrelated classes: as liturgical rites no longer celebrated or as theatrical works of dubious quality. This ground-breaking work examines "liturgical drama" according to the contexts of their presentations within the manuscripts and books that preserve them.