Louis Cartier was a French jeweler and watchmaker, born in 1875. He is best known for founding the luxury watch brand Cartier, which became famous for its innovative designs and high-quality craftsmanship. Cartier played a significant role in popularizing wristwatches, transforming them from a primarily military accessory into a fashionable item for both men and women. In 1904, Louis designed the Santos-Dumont, one of the first modern wristwatches, for his friend, aviator Alberto Santos-Dumont. This design marked a turning point in watchmaking, leading to the creation of iconic timepieces that are still celebrated today. Louis Cartier's legacy continues to influence the luxury watch industry.