English summary: The Cistercian abbey Altzelle was also well known in the Late Middle Ages as the center for research and education, above all through its comprehensive library, the items of which were continuously collected by a number of scholars in the convent. Among the extant manuscripts are-exceptionally, for a Cistercian abbey- several manuscripts in the vernacular, which, for the most part, either were produced or made their way to Altzelle...