Graeco-Aryan has comparatively wide support among Indo-Europeanists for the Indo-European Homeland to be located in the Armenian Highland. Early and strong evidence was given by Euler's 1979 examination on shared features in Greek and Sanskrit nominal flection.
In the context of the Kurgan hypothesis, Greco-Aryan is also known as "Late PIE" or "Late Indo-European" (LIE), suggesting that Greco-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, moving westward and eastward from the Pontic Steppe, respectively.
If Graeco-Aryan is a valid group, Grassmann's law may have a common origin in Greek and Sanskrit. Note, however, that Grassmann's law in Greek postdates certain sound changes that happened only in Greek and not Sanskrit, which suggests that it cannot strictly be an inheritance from a common Graeco-Aryan stage. Rather, it is more likely an areal feature that spread across a then-contiguous Graeco-Aryan-speaking area after early Proto-Greek and Proto-Indo-Iranian had developed into separate dialects but before they ceased being in geographic contact.
^Renfrew, A.C., 1987, Archaeology and Language: The Puzzle of Indo-European Origins, London: Pimlico. ISBN 0-7126-6612-5; T. V. Gamkrelidze and V. V. Ivanov, The Early History of Indo-European Languages, Scientific American, March 1990; Renfrew, Colin (2003). "Time Depth, Convergence Theory, and Innovation in Proto-Indo-European". Languages in Prehistoric Europe. ISBN3-8253-1449-9.
^A. Bammesberger in The Cambridge History of the English Language, 1992, ISBN 978-0-521-26474-7, p. 32: the model "still remains the background of much creative work in Indo-European reconstruction" even though it is "by no means uniformly accepted by all scholars".
^Indoiranisch-griechische Gemeinsamkeiten der Nominalbildung und deren indogermanische Grundlagen (= Aryan-Greek Communities in Nominal Morphology and their Indoeuropean Origins; in German) (282 p.), Innsbruck, 1979