Brigid (Bríd)
Goddess of poetry, smithcraft and healing, and then a saint with the same name, the same feast and several of the same stories.
Brigid is the clearest case in Irish tradition of a goddess and a saint occupying the same ground, and nobody has ever fully separated them.
The goddess is a daughter of the Dagda and belongs to the Tuatha Dé. She has three domains that look unrelated until you notice they are all about transformation: poetry, which turns experience into words, smithcraft, which turns ore into tools, and healing, which turns the sick into the well. In some tellings she is herself three sisters of the same name, one for each.
Her feast is the first of February, which is Imbolc, the old quarter day marking the start of spring and the first milk of the lambing ewes. Saint Brigid of Kildare, who is also given as a historical abbess of the sixth century, has her feast on exactly that day, keeps a perpetual fire at Kildare tended only by women, and is patron of many of the same things.
What the overlap means is argued over. It may be that an early Christian community absorbed a local goddess, or that a real woman's cult attracted older material, or both at once over centuries. What is not in doubt is that the Brigid's cross, woven from rushes on the last night of January, is still made in Irish houses, and that since 2023 it has been a public holiday in Ireland, taken on the first Monday of February, the first Irish public holiday named for a woman.