Heimskringla News

Óðinn kept Mímir’s head by him, and it told him much news from other worlds,
and sometimes he awakened the dead from the earth or sat himself under
hanged men. Because of this he was called draugadróttinn (‘lord of ghosts’)
or hangadróttinn (‘lord of the hanged’). He had two ravens which he
had trained to speak. They flew over distant countries and told him much
news. From these things he became extremely wise.


- Heimskringla, Ynglinga Saga, Chapter 7