Gráinne is a figure from Irish mythology, often associated with the Tuatha Dé Danann, a race of supernatural beings. She is known for her beauty and strength, and her story is primarily told in the tale of Gráinne Mhaol, where she defies traditional gender roles and seeks adventure. In the legend, Gráinne falls in love with Diarmuid, a warrior, and elopes with him, leaving her betrothed, Fionn mac Cumhaill, behind. Their journey is filled with challenges, showcasing themes of love, loyalty, and the struggle against fate in ancient Irish storytelling.