The Psalterium feriatum was written in 1472 by the Carthusian monk
Johannes Gipsmüller of Basel. Although there is no note of
ownership, it certainly was meant to be used in his monastery.
Throughout the Psalter there are hymns, antiphons, etc., many with
musical notations. For quickly finding texts in the Liturgy of the
Hours, red and white tabs protrude from the front edge.