A libellus precum (literally "booklet of prayings, booklet of petitions", plural: libelli precum) is a medieval collection of prayers, a prayerbook, in the manuscript form, although the term is applied by scholars to texts of some other types.
The beginning of the scholarship recognizing them as a distinct type of literature is attributed to André Wilmart.
[1] The Encyclopedia of the Middle Ages says they are coming mainly from the Anglo-Saxon and Celtic lands.
[2] Typically libelli precum are unique texts, varying in prayers collected.
[1] Notable examples include Ælfwine's Prayerbook, folia Gertudiana, the prayerbook of Princess Gertrude of Poland included into the Egbert Psalter, Nawojka's Prayerbook [pl] There are several historical texts referred to by the title Libellus Precum (in both meanings): This article about an illuminated manuscript is a stub.