Part I, which was added to the manuscript at Cerne (Dorset), does not concern us here.
Part II, the central section, is a Mercian prayerbook of the early 9th century. The title Book of Cerne is often reserved for this part only, although it may not have arrived at Cerne until the end of the Middle Ages.
Part III, which was added to the manuscript at Cerne (Dorset), does not concern us here.