Mímir or Mim is a figure in Norse mythology, renowned for his knowledge and wisdom, who is beheaded during the Æsir–Vanir War. Afterward, the god Odin carries around Mímir's head and it recites secret knowledge and counsel to him.
A 19th century depiction of Odin finding Mímir's beheaded body.
"Mímer and Balder Consulting the Norns" (1821–1822) by H. E. Freund
In Norse mythology, the Æsir–Vanir War was a conflict between two groups of deities that ultimately resulted in the unification of the Æsir and the Vanir into a single pantheon. The war is an important event in Norse mythology, and the implications for the potential historicity surrounding accounts of the war are a matter of scholarly debate and discourse.
Óðinn throws his spear at the Vanir host, illustration by Lorenz Frølich (1895)
Gullveig is executed, illustration by Lorenz Frølich (1895).
"The Æsir Against the Vanir" (1882) by Karl Ehrenberg.
Óðinn with Mímir's body, illustration by Georg Pauli (1893)