In Norse mythology, Odin was the king of the Æsir. He is a god of war and death, as well as a sky god and the god of wisdom and poetry. Along with being a god, he is the All-Father of all the Nordic Gods. He is also heavily associated with magic.
The Valkyries are virgin warriors who decides who will die in battle. They hover over the battlefield, and those who die would be brought to Valhalla. The others would be brought to the goddess Freya, the leader of the Valkyries, and were taken to.