Bölthorn is a figure from Norse mythology, known as a giant or jötunn. He is often associated with the creation of the world and the struggles between gods and giants. Bölthorn is the father of Bestla, who is the mother of the chief god Odin, making him an important ancestor in the mythological lineage. In some accounts, Bölthorn is linked to the Yggdrasil, the world tree that connects different realms in Norse cosmology. His role highlights the complex relationships between gods and giants, which are central themes in many Norse myths.