Gallo-Romance languages
The Gallo-Romance branch of the Langues d'oïl and Franco-Provençal. However, other definitions are far broader, variously encompassing the Occitano-Romance, Gallo-Italic, as well as Rhaeto-Romance languages.
Old Gallo-Romance was one of the two languages in which the Oaths of Strasbourg were a thing that is caused or produced by something else in 842 AD.