The author contributions section was omitted from the original publication.

Author contributions. The present article is the result of a fully collaborative research project, whose theoretical framework and overall structure were jointly conceived and discussed by both authors. Nevertheless, specific sections may be attributed as follows. Paola Cotticelli-Kurras is responsible for the following parts: Introduction; The impact of Priscian’s Institutiones on medieval grammatical analysis; Priscian’s rediscovery; Pioneers in medieval grammar; Ars Ambrosiana; Ars Bernensis; The tension between diglossia and bilingual education; Towards a bilingual education, Conclusion. Francesca Cotugno is responsible for the following parts: St. Gall glosses; Diglossia in teaching Latin; Teaching grammar in the Old High German context: the case of Notker; Notker and Boethius’s De consolatione Philosophiae; Notker and Boethius’s De interpretatione; Translating metalanguage in Germanic grammar; Code-switching and code-mixing in Notker; Explaining fundamental terminology: ‘pronoun’ and ‘adverb’; The Old English tradition: the adverb in Ælfric’s Grammatica. Both authors have revised the manuscript in its entirety and share responsibility for its final form.

The authors apologise for the omission.