What is "gullveig"

In Norse mythology, Gullveig is a being who was speared by the Æsir, burnt three times, and yet thrice reborn. Upon her third rebirth, Gullveig's name becomes Heiðr and she is described as a knowledgeable and skillful völva. Gullveig/Heiðr is solely attested in the Poetic Edda, compiled in the 13th century from earlier traditional material. Scholars have variously proposed that Gullveig/Heiðr is the same figure as the goddess Freyja, that Gullveig's death may have been connected to corruption by way of gold among the Æsir, and/or that Gullveig's treatment by the Æsir may have led to the Æsir-Vanir War.