The Vulgar Latin in the region of Gallia took on a distinctly local character, some of which is attested in graffiti, which evolved into the Gallo-Romance dialects which include French and its closest relatives. The influence of substrate languages may be seen in graffiti showing sound changes that matched changes that had earlier occurred in the indigenous languages, especially Gaulish. The Vulgar Latin in the north of Gaul evolved into the langues d'oil and Franco-Provencal, while the dialects in the south evolved into the modern Occitan and Catalan tongues. Other languages held to be "Gallo-Romance" include the Gallo-Italic languages and the Rhaeto-Romance languages.