The Spanish Divine Office comprised two distinct types: the cursus cathedralis (ecclesiasticus) (“cathedral Office) and the cursus monasticus (“monastic Office”). The main difference is that the cathedral (ecclesiastical) Office boasted a wide variety of liturgical books, whereas the monastic Office relied only on the Psalter and the Liber Horarum.

Among the numerous books of the Spanish cathedral Office, one in particular stands out: the Liber Psalmographus. This work is distinct from the Liber Orationum festivus.

The Psalmographus is a liturgical book of which not a s…