During the cataloging of musical collections from the former Cistercian library of Krzeszów (Grussau), a discovery was made of a fragment of a metric office dedicated to St Stanislaus Dies adest Celebris, composed to commemorate the translation of the saint's bodily remains on 27th September. A comparative analysis of the find has yielded the following conclusions: 1. The office closely resembles a similar text found in a late 15th-century Antiphonal from the Wroclaw Cathedral. 2. Both German and Romance dialects are evident in portions designed for singing, supporting the Cistercian origin of the text. As ethnic Germans, they used their German dialect, while as members of an order founded in Burgundy, they used a French dialect. 3. The manuscript can be dated to the 15th century based on the form of majuscule and minuscule characters, the use of late 15th-century Gothic notation of Metz, and its compatibility with the musical style of the 15th century. 4. The Silesian origin of the text is supported by significant similarities with the late 15th-century Antiphonal of the Wroclaw Cathedral. 5. The musical notation resembles liturgical and musical sources of Cistercian origin.
The weight of the evidence suggests that the manuscript in question comes from a Cistercian monastery. However, it is not certain that it must have originated from Krzeszów.