The figure receives mention in the Poetic Edda, composed in the 13th century from earlier traditional sources, and the Prose Edda, compiled by Icelander Snorri Sturluson in the 13th century. Scholars have noted that the Poetic Edda mention may mean that he is the father of the wise being Mímir.
Nine magic songs I got [learned?] from the famous son
Of Bölthor, Bestla’s father,
And I got a drink of the precious mead,
Poured from [by? to?] Ódrerir.
He married that woman who was called Bestla, the daughter of the giant Bölthorn. They had three sons; the first was called Odin, the second Vili, the third Vé.
It is often argued that the figure of Bölþorn embodies a traditional relationship with the maternal uncle, a pattern found in Germanic myths and legends alike. According to Orchard, the Roman historian Tacitus (1st c. AD) "had already noted the importance of that particular family tie in Germanic society, and there are numerous examples of the closeness of male figures with their maternal uncles in the literary sources." For instance, a medieval Icelandic proverb goes by saying: "Men turn out most like their maternal uncles." Lindow comments : "Certainly Odin, of all the gods, turned out most like a giant."
- Bellows, Henry Adams (1923). The Poetic Edda. The American-Scandinavian Foundation.
- Faulkes, Anthony, trans. (1987). Edda (1995 ed.). Everyman. ISBN 0-460-87616-3.
- Orchard, Andy (1997). Dictionary of Norse Myth and Legend. Cassell. ISBN 978-0-304-34520-5.
- Puhvel, Jaan (1989). Comparative Mythology. Johns Hopkins University Press. ISBN 978-0-8018-3938-2.
- Lindow, John (2002). Norse Mythology: A Guide to Gods, Heroes, Rituals, and Beliefs. Oxford University Press. ISBN 978-0-19-983969-8.