Horse sacrifice

Many Indo-European religious branches show evidence for horse sacrifice, and comparative mythology suggests that they derive from a Proto-Indo-European (PIE) ritual.

Often horses are sacrificed in a funerary context, and interred with the deceased, a practice called horse burial. There is evidence but no explicit myths from the three branches of Indo-Europeans of a major horse sacrifice ritual based on a mythical union of Indo-European kingship and the horse. The Indian Aśvamedha is the clearest evidence preserved, but vestiges from Latin and Celtic traditions allow the reconstruction of a few common attributes.

Some scholars, including Edgar Polomé, regard the reconstruction of a PIE ritual as unjustified due to the difference between the attested traditions.

The Gaulish personal name Epomeduos is from ek'wo-medhu- ("horse + mead"), while aśvamedha is either from ek'wo-mad-dho- ("horse + drunk") or ek'wo-mey-dho- ("horse + strength").

The reconstructed myth involves the coupling of a king with a divine mare which produced the divine twins. A related myth is that of a hero magically twinned with a horse foaled at the time of his birth (for example Cuchulainn, Pryderi), suggested to be fundamentally the same myth as that of the divine twin horsemen by the mytheme of a "mare-suckled" hero from Greek and medieval Serbian evidence, or mythical horses with human traits (Xanthos), suggesting totemic identity of the Indo-European hero or king with the horse.

The Indian Ashvamedha involves the following:

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