Mímir
Mímir, or Mim is one of the Æsir gods of Germanic mythology, renowned for his wisdom and knowledge. He was beheaded during the Æsir-Vanir War. Afterwards, Odin reanimated Mímir’s head so that he could learn his secret knowledge as counsel.
Mythology
Mímir came into contact with Odin when the latter arrived to drink from the well he owned in Jötunheim. He informed Odin that in order to drink from it, and attain higher knowledge, he had to make a sacrifice. Odin offered his left eye, and in so doing, infused his spirit into the well.
Mímir later was one of the two Æsir hostages Odin sent to Vanaheim after the Æsir-Vanir War. Yet the Vanir gods saw through the ruse and cut off Mímir’s head. Odin had the head reanimated by embalming it with herbs and sacred magic, which gave it the power to speak and reveal secrets to him.