Rome left Britain very few names and almost none of its language, while in Gaul Latin replaced Gaulish and became French. Yet the Celtic past kept surfacing: Paris and Reims are named after Gaulish tribes, and Lincoln, York and Manchester are Latinised British names.

Drag the slider through history. Colour shows where each language was spoken, and overlaps are where they shared the land. Tap a marker for the story of its name.