Bor and Ymir are characters from a Norse creation story. Ymir, a jötunn, or Frost Giant, was formed from melting ice. He fed on the milk of the cow Auðhumla, who licked the salty ice and released a man, Buri. Buri had three sons, one of whom was Bor (who later became father of the god Odin). When Ymir turned to evil, Bor's sons slew him, creating the world of humans from his divided body. His blood became the seas, his flesh the earth, his bones the mountains, his hair the trees, and his brains the clouds in the sky.