This article concerns a newly discovered Carolingian text that is arguably one of the oldest witnesses to the use of the Liber Glossarum. Preserved in two codices, the text bears the name Glosae de diuersis doctoribus collectae in regula Benedicti abbatis. It systematically applies entries from the Liber Glossarum to the Rule of Benedict. The text most likely originated as a means of providing instruction to novices and aims at fostering theological, as well as lexical and grammatical, comprehension of the Rule. It is a unique source of information regarding the implementation of monastic reforms, as well as Carolingian techniques of teaching, reading, and writing. This article analyzes a number of philological problems, especially the relationship between the Glosae, the Liber Glossarum, and Smaragdus of St. Mihiel’s Expositio in regulam Benedicti.