The ancient Greeks called the lavender herb nardus, after the Syrian city of Naarda. It was also commonly called nard.
During Roman times, flowers were sold for 100 denarii per pound, which was about the same as months wage for a farm labourer or 50 haircuts from the local barber. Lavender was commonly used in Roman baths to scent the water, and it was thought to restore the skin. When the Roman Empire conquered southern Britain, the Romans introduced lavender.
During the height of the Plague, glove makers at Grasse would scent their leathers with lavender oil, and this was claimed to ward off the Plague. This story could have some validity as the Plague was transmitted by fleas, which lavender is known to repel.
