Localised and dated administrative documents and other such textual resources in three Anglo-Norman electronic corpora provide a new perspective on variation in pre-modern French. They may offer insights into important aspects of spatial and register variation across time. These new resources allow for a better-informed picture of semantic-pragmatic changes in the history of French than is available in traditional approaches favouring the development of francien and standard French. It is shown here that the the connectives pourtant et à cause que appear in Anglo-Norman with their present-day meanings well before the dates proposed in historical reference dictionaries. Frequent data occurrences available from Anglo-Norman texts of the XIVth century will facilitate the investigation of the beginnings of semantic changes in post-medieval French lexis.