Who invented citronella?

Citronella oil is derived from the leaves and stems of certain species of lemongrass, primarily Cymbopogon nardus and Cymbopogon winterianus. While no single person "invented" citronella, its use as a natural insect repellent dates back to ancient times, particularly in regions where these plants are native, such as Southeast Asia. The oil has been popularized and commercialized in modern times for various uses, including candles and sprays.