Sól (Old Norse "Sun") or Sunna (Old High German, and existing as an Old Norse and Icelandic synonym: see Wiktionary sunna, "Sun") is the Sun personified in Norse mythology. One of the two Old High German Merseburg Incantations, written in the 9th or 10th century CE, attests that Sunna is the sister of Sinthgunt. In Norse mythology, Sól is attested in the Poetic Edda, compiled in the 13th century from earlier traditional sources, and the Prose Edda, written in the 13th century by Snorri Sturluson.
In both the Poetic Edda and the Prose Edda she is described as the sister of the personified Moon, Máni, is the daughter of Mundilfari, is at times referred to as Álfröðull, and is foretold to be killed by a monstrous wolf during the events of Ragnarök, though beforehand she will have given birth to a daughter who continues her mother's course through the heavens. In the Prose Edda, she is additionally described as the wife of Glenr. As a proper noun, Sól appears throughout Old Norse literature. Scholars have produced theories about the development of the goddess from potential Nordic Bronze Age and Proto-Indo-European roots.
One of the two Merseburg Incantations (the "horse cure"), recorded in Old High German, mentions Sunna, who is described as having a sister, Sinthgunt. The incantation describes how Phol and Wodan rode to a wood, and there Balder's foal sprained its foot. Sinthgunt sang charms, her sister Sunna sang charms, Friia sang charms, her sister Volla sang charms, and finally Wodan sang charms, followed by a verse describing the healing of the foal's bone.
Scholars have proposed that Sól, as a goddess, may represent an extension of an earlier Proto-Indo-European deity due to Indo-European linguistic connections between Norse Sól, Sanskrit Surya, Common Brittonic Sulis, Lithuanian Saulė, Latin Sol, and Slavic Tsar Solnitse.
Regarding Sól's attested personifications in Norse mythology, John Lindow states that "even kennings like 'hall of the sun' for sky may not suggest personification, given the rules of kenning formation"; that in poetry only stanzas associated with Sól in the poem Vafþrúðnismál are certain in their personification of the goddess; and "that Sól is female and Máni male probably has to do with the grammatical gender of the nouns: Sól is feminine and Máni is masculine." Lindow states that, while the Sun seems to have been a focus of older Scandinavian religious practices, it is difficult to make a case for the placement of the sun in a central role in surviving sources for Norse mythology.
Rudolf Simek states that Nordic Bronze Age archaeological finds, such as rock carvings and the Trundholm sun chariot, provide ample evidence of the Sun having been viewed as a life-giving heavenly body to the Bronze Age Scandinavians, and that the Sun likely always received an amount of veneration. Simek states that the only evidence of the Sun assuming a personification stems from the Old High German Incantation reference and from Poetic Edda poems, and that both of these references do not provide enough information to assume a Germanic sun cult. "On the other hand", Simek posits, the "great age of the concept is evident" by the Trundholm sun chariot, which specifically supports the notion of the Sun being drawn across the sky by horses. Simek further theorizes that the combination of sun symbols with ships in religious practices, which occur with frequency from the Bronze Age into Middle Ages, seem to derive from religious practices surrounding a fertility god (such as the Vanir gods Njörðr or Freyr), and not to a personified sun.