Bohemian songs for mass and prayer of the Liturgy of the Hours from the early 15th-century Prague university milieu. The manuscript contains a Latin hymn translated into Czech, as well as original music to Czech texts. When, in 1872, the student Leopold Katz discovered in the attic of the presbytery in the South Bohemian village of Jistebnice an old manuscript of Czech songs, he might not have realized just how enormous its value was. Yet the most notable aspect of the hand-written hymnbook is that it features songs in Czech for mass and prayer of the Liturgy of the Hours.