The Swedish tradition has its origins in both the pre-Christian and Christian customs. According to folklore was December 13th a dangerous night because many supernatural powers was in motion then. It was believed also that the animals could speak during lucia night. All Christmas preparations would be ready by lucia day and celebrated by eating and drinking a little extra. Even pets got extra feed. During the last days with the Julian calendar the bill, that is, before the current Gregorian calendar was introduced during the 1700s, fell Lucia days while the winter solstice in the northern hemisphere.
Lucia is one of the few festivals in the Scandinavian Protestant countries, which is named after a saint: Saint Lucia, the patron saint of Syracuse, who died in 300’s. The Swedish celebration linked to Saint Lucia is basically nonexistent, and the name of the Festival of Lights is a recent phenomenon than the actual celebration