The package for Arthur contained a copy of a Book of Hours, which explains the Canonical hours such as Matins, Lauds and Vespers.
Canonical hours, the recitation of such prayers in Christianity more generally
Jutta taught Hildegard to write; to read the collection of psalms used in the liturgy; and to chant the Opus Dei (‘work of God’), the weekly sequential recitation of the Canonical hours.
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The entire office, or series of prayers and psalms said (or chanted) in the Roman Catholic Church — Vespers, Matins, Lauds and Mass — is called plenarium.