The 28 stallions, all around six years old, had been buried shortly after they died, each placed in pits on their right ride with their head facing south.
Experts from France's National Institute for Preventive Archaeological Research (Inrap), say carbon dating places the remains to the time of the Gallic wars, around the end of the Roman conquest of what was then Gaul and the beginning of the empire of ancient Rome between 100 BC and AD100.