Ymir

Ymir was the first being that came out of the primordial void, Ginnungagap, also making him the first Jotunn. His children, born from his armpits and feet, ruled Nilfheim, the World of Ice. Ymir was finally slain by Odin and his brothers, and his body was used to form Midgard, the World of Humans. Ymir's flesh became the earth, his blood – the sea, his bones – the mountains, and his teeth – rocks and cliffs. Finally, Ymir's skull became the sky, protecting Midgard from above. The maggots that chewed through his decaying flesh evolved into the first dwarfs.