Proto-Indo-European (PIE) is the reconstructed common ancestor of the Indo-European language family. ... (1874–77) represented an early attempt to reconstruct the proto-Indo-European language. By the early 1900s, Indo-Europeanists had developed well-defined descriptions of PIE which scholars still accept today.

Proto-Indo-European mythology is the body of myths and deities associated with the Proto-Indo-Europeans, ... The Khvalynsk culture, associated with the archaic Proto-Indo-European language, had already shown archeological evidence for the sacrifice of domesticated animals.