Convergence by Shared Ancestry in Romance

In many cases of apparent contact-induced change the contribution of genealogical correlation in the language sample and its interaction with processes such as matter and pattern replication are difficult to specify. In order to get a better sense of the relevance of shared ancestry, we quantify the change in similarity since the late Middle Ages in a sample of Romance and Germanic languages with data from a selected grammatical domain (expression of reflexivity). We compare their dynamics to patterns of change of similarity in two contact zones in Europe, namely the British Isles (Dedio et al., 2019) and the Balkans. Concerning the genealogical signal, the results indicate a maintenance and gain of similarity in Romance as opposed to a loss of similarity in Germanic. This hints at the importance of the inherited states, the time since the split from the common ancestor, and subsequent developments. We presume that these factors are likely to be at the origin of the maintenance and increase in similarity observed for the sampled Romance varieties. While this result cannot be generalized beyond the specific case study presented here, the basic approach will contribute to a better understanding of how contact, genealogy and culture interact in shaping the dynamics of linguistic similarity.