The year 2026 marks the quatercentenary of the death of Anglican bishop and theologian Lancelot Andrewes. A gifted pastor, preacher, and spiritual writer, Andrewes was deeply committed to the concept of the Church as ecclesia orans—the Church at prayer. Although he advocated for the daily personal (or private) prayer of every baptised Christian, even compiling his Preces Privatae Quotidinae, he never separated this personal devotion from the common life of the People of God. In this lecture, Professor Peters will investigate Andrewes’ dual commitment to the Church as the Body of Christ and to individual personal prayer, examining both in relation to the role and function of the Book of Common Prayer as the prayer book for the entire Church.