Brighid (of the many spellings) is an Irish Goddess of fire, smithcraft, poetry, healing, and fertility. She is the daughter of the Dagda, and so in theory one of the Tuatha Dé Danann, the people of the Goddess Danu, Who became the fairies of legend; but She has a long history. She is related to the earlier Goddess Brigantia, the main Goddess of the Brigantes, a tribe in northern Britain, and probably also to the Gaulish Goddess Brigindo. Either way Her name means 'Exalted One' or 'High One'.
Brighid proved so popular that even Christianity couldn't suppress Her; She was instead adopted into that religion as Saint Brigid. Either way, as Pagan or Christian, the holiday on February 1st—Imbolc or Saint Brigid's Day—was Hers.