Lily of the valley or "Muguet du Bonheures" of has represented different things across the centuries. In the Victorian era, it symbolized a return to happiness. In ancient times it was associated with humility and purity, as well as the goddess Ostara (from whose name we get our modern Easter). It's also been associated with the Greek god Apollo, who is said to have created it so his nymphs would have a soft carpet to walk on. In contemporary times it is associated with motherhood and happiness, but most formally with spring, especially May.