In Norse mythology, Heimdallr is a god who possesses the resounding horn Gjallarhorn, owns the golden-maned horse Gulltoppr, has gold teeth, and is the son of Nine Mothers. Heimdallr is attested as possessing foreknowledge, keen eyesight and hearing, is described as "the whitest of the gods", and keeps watch for the onset of Ragnarök while drinking fine mead in his dwelling Himinbjörg, located where the burning rainbow bridge Bifröst meets heaven. Heimdallr is said to be the originator of social classes among mankind, once regained Freyja's treasured possession Brísingamen while doing battle in the shape of a seal with Loki, and Heimdallr and Loki are foretold to kill one another during the events of Ragnarök. Heimdallr is additionally referred to as Hallinskiði, Gullintanni, and Vindlér or Vindhlér.
Heimdallr is attested in the Poetic Edda, compiled in the 13th century from earlier traditional material; in the Prose Edda and Heimskringla, both written in the 13th century by Snorri Sturluson; in the poetry of skalds; and on an Old Norse runic inscription found in England. Two lines of an otherwise lost poem about the god, Heimdalargaldr, survive. Due to the problematic and enigmatic nature of these attestations, scholars have produced various theories about the nature of the god, including his apparent relation to rams, that he may be a personification of or connected to the world tree Yggdrasil, and potential Indo-European cognates.
A lead spindle whorl bearing an Old Norse Younger Futhark inscription that mentions Heimdallr was discovered in Saltfleetby, England on September 1, 2010. The spindle whorl itself is dated from the year 1000 to 1100 AD. On the inscription, the god Heimdallr is mentioned alongside the god Odin and Þjálfi, a name of one of the god Thor's servants. Regarding the inscription reading, John Hines of Cardiff University comments that there is "quite an essay to be written over the uncertainties of translation and identification here; what are clear, and very important, are the names of two of the Norse gods on the side, Odin and Heimdallr, while Þjalfi (masculine, not the feminine in -a) is the recorded name of a servant of the god Thor."