Graeco-Aryan, or Graeco-Armeno-Aryan, is a hypothetical clade within the Indo-European family that would be the ancestor of Hellenic, Armenian, and the Indo-Iranian languages, which spans Southern Europe, Armenian highlands and Southern Asian regions of Eurasia.
The Graeco-Armeno-Aryan group supposedly branched off from the parent Indo-European stem by the mid-3rd millennium BC.
Proto-Indo-European mythology is the body of myths and deities associated with the Proto-Indo-Europeans, speakers of the hypothesized Proto-Indo-European language. Although the mythological motifs are not directly attested – since Proto-Indo-European speakers lived in preliterate societies – scholars of comparative mythology have reconstructed details from inherited similarities in mythological concepts found in Indo-European languages, based on the assumption that parts of the Proto-Indo-Europeans' original belief systems survived in the daughter traditions.
The Proto-Indo-European pantheon includes a number of securely reconstructed deities, since they are both cognates—linguistic siblings from a common origin—and associated with similar attributes and body of myths: such as *Dyḗws Ph₂tḗr, the daylight-sky god; his consort *Dʰéǵʰōm, the earth mother; his daughter *H₂éwsōs, the dawn goddess; his sons the Divine Twins; and *Seh₂ul and *Meh₁not, a solar deity and moon deity, respectively. Some deities, like the weather god *Perkʷunos or the herding-god *Péh₂usōn, are only attested in a limited number of traditions—Western (i.e. European) and Graeco-Aryan, respectively—and could therefore represent late additions that did not spread throughout the various Indo-European dialects.