This study analyzes the historical and sociolinguistic dynamics of dialect contact among Galloitalic dialects in Eastern Piedmont, which have been reconstructed with the analysis of several linguistic features. They have been examined at several levels of linguistic analysis, with special attention to the diatopic and diachronic variation. The study makes use of a great array of sources for linguistic data, such as field interviews, linguistic atlases, descriptive grammars, and historical texts.