Graeco-Aryan
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. Relation to the possible homeland In the context of the Kurgan hypothesis, Graeco-Aryan is also known as "Late Proto-Indo-European" or "Late Indo-European" to suggest that Graeco-Aryan forms a dialect group, which corresponds to the latest stage of linguistic unity in the Indo-European homeland in the early part of the 3rd millennium BC. By 2500 BC, Proto-Greek and Proto-Indo-Iranian had separated and moved respectively westward and eastward from the Pontic Steppe. If Graeco-Aryan is a valid group, Grassmann's law may have a common origin in Greek and Sanskrit. However, Grassmann's law in Greek postdates certain sound changes that happened only in Greek, not Sanskrit, which suggests that it could not have been inherited directly from a common Graeco-Aryan stage. Rather, it is more likely that an areal feature spread across a then-contiguous Graeco-Aryan–speaking area. That would have occurred after early stages of Proto-Greek and Proto-Indo-Iranian had developed into separate dialects