Assessing Gallo-Roman mobility at the Rue Jacques Brel necropolis site (1st to 3rd c. CE), France

•δ18O and 87Sr/86Sr values were used to assess mobility at Rue Jacques Brel necropolis.•Bagplot analysis of δ18Odw and 87Sr/86Sr values did not identify any distinct outliers.•Mobility at Gallo-Roman Rue Jacques Brel appears evident to a limited degree.•Regions of isotopic value homogeneity remain a challenge for assessing mobility.•Rue Jacques Brel brings forth questions about mobility in Imperial Roman provinces.