Bayesian phylogenetic analysis of Semitic languages identifies an Early Bronze Age origin of Semitic in the Near East - PMC
Estimated divergence times:
- Semitic: East (Akkadian), West: 5750 BP (3750 BCE)
- West Semitic: Central, South: 5500 BP (3500 BCE)
- Central Semitic: Arabic, Northwest Semitic: 4500 BP (2500 BCE)
- Northwest Semitic: Ugaritic, H-A: 4000 BP (2000 BCE)
- H-A: Hebrew, Aramaic: 3500 BP (1500 BCE)
- South Semitic: South Arabic, Ethiosemitic: 4750 BP (2750 BCE)
- South Arabic: 2000 BP (1 CE)
- Ethiosemitic: 2750 BP (750 BCE)
Error bars ~ 1000 years each way
Their identified homeland: the Levant, the east coast of the Mediterranean Sea: Israel/Palestine, Lebanon, Syria.
With the northeast-African hypothesis of the Afroasiatic homeland, it is evident that some AA speakers have gone full circle and arrived back in their old homeland.
That has also happened with the Indo-European family. The PIE homeland is roughly Ukraine - South European Russia - Kazakhstan, and the PIE speakers spread southward to Anatolia, eastward to the Tarim Basin, becoming Tocharian speakers, and northward to the northern European plain, becoming Late-PIE speakers, and creating the Corded Ware culture.
That was a long strip roughly from Brussels to Moscow, though much older than either city, and the easternmost Corded Ware people pushed further eastward, crossing the Ural Mountains and founding the Sintashta culutre, speaking Proto-Indo-Iranian. Some of them went south and then west, becoming Scythians and Sarmatians, going full circle.
There were also plenty of later IE-speaking returnees and almost returnees.
The region of Galicia in Ukraine has a name that suggests that Celts were once there, something not very farfetched, because Celts sacked Delphi, Greece in 279 BC, and settled in Anatolia, becoming the Galatians mentioned in the New Testament.
The Roman Empire got a little bit into the PIE homeland with conquering some of Crimea and getting close to its western end.
In the early Middle Ages, Germanic tribes spread out of their homeland in N Germany, Denmark, and S Sweden, overrunning much of Europe. In some places the people that they overran ended up speaking Germanic dialects, but in other places, they became assimilated enough to end up speaking the languages of the people that they conquered. Some of these Germanic wanderers ended up in Crimea, the Crimean Goths.
Some time later, Slavs spread out of their homeland near where Poland, Ukraine, and Belarus meet, going westward, southward, and eastward. As a result, the people of the PIE homeland now speak Eastern Slavic languages.