Proto-Greek emerged from the diversification of the Proto-Indo-European language (PIE), the last phase of which gave rise to the later language families occurred ca. 2500 BCE. Pre-Proto-Greek, the Indo-European dialect from which Proto-Greek originated, emerged ca. 2400 BCE - 2200 BCE in an area which bordered pre-Proto-Indo-Iranian to the east and pre-Proto-Armenian and pre-Proto-Phrygian to the west, at the eastern borders of southeastern Europe. Speakers of what would become Proto-Greek, migrated from their homeland (which could have been northeast of the Black Sea) throughout Europe and reached Greece in a date set around the transition of the Early Bronze Age to the Middle Bronze Age. The evolution of Proto-Greek could be considered within the context of an early Paleo-Balkan sprachbund that makes it difficult to delineate exact boundaries between individual languages. The characteristically Greek representation of word-initial laryngeals by prothetic vowels is shared, for one, by the Armenian language, which also seems to share some other phonological and morphological peculiarities of Greek; this has led some linguists to propose a hypothetically closer relationship between Greek and Armenian, although evidence remains scant.