This brief night prayer has been closing the Christian day for well over a thousand years, beginning as a Latin evening collect in early medieval Roman service-books, passing through the Sarum Compline of pre-Reformation England, and reaching its familiar English form through Thomas Cranmer in 1549. Cranmer's translation added the now-characteristic Christological ending, and in every Book of Common Prayer since, the prayer has stood as the Third Collect at Evening Prayer – a petition so urgent it skips the customary address to God and plunges straight to its plea.