LANGUAGE × PEOPLING
The Indo-European Languages
~6,000 years ago (debated)
Neolithic · Neolithic · Holocene · Northgrippian
Indo-European is a language family, that is a set of tongues descended from one earlier tongue; Bouckaert and colleagues built their analysis on core vocabulary from 103 of its ancient and living members. Where and when that earlier tongue was spoken is disputed, and two proposals have long divided the field. The first puts the homeland in the Pontic-Caspian steppe about 6,000 years ago, the language spreading with herders; the second in Anatolia, 8,000 to 9,500 years ago, spreading with farmers. Bouckaert's phylogeographic analysis reported decisive support for Anatolia. Ancient DNA then spoke for the steppe: Haak and colleagues found that Corded Ware people in Germany drew about three-quarters of their ancestry from the Yamnaya, herders of the steppe, around 4,500 years ago. Heggarty and colleagues have since proposed a hybrid, with a root age near 8,120 years and a first homeland south of the Caucasus.
Why it matters
Each hypothesis carries a different account of how a language travels. On the Anatolian reading it moves with the expansion of farming, across eight or nine millennia. On the steppe reading it moves with herders in far less time, and the record of that movement is still legible in living people, since steppe ancestry is ubiquitous in present-day Europeans. Lazaridis and colleagues place the last common stage of Anatolian and the rest of the family between 4400 and 4000 BCE, among populations of the Caucasus and the lower Volga, which is neither of the two classic homelands.
Dating & uncertaintyDisputed
The bracket here, 9,000 to 5,000 years before present, holds both camps rather than splitting them. Bouckaert and colleagues reported decisive support for Anatolia and a start 8,000 to 9,500 years ago. Haak and colleagues read the ancient DNA as support for a steppe origin of at least some of the European branches, on the conventional figure of about 6,000 years. Heggarty and colleagues obtain a root age near 8,120 years, which they state is not consistent with the steppe hypothesis while not ruling out a homeland south of the Caucasus. The 6,000 years displayed is the steppe figure, not a verdict.
Sources
- Heggarty et al. (2023), Science · Language trees with sampled ancestors support a hybrid model for the origin of Indo-European languagesdoi:10.1126/science.abg0818
- Bouckaert et al. (2012), Science · Mapping the Origins and Expansion of the Indo-European Language Familydoi:10.1126/science.1219669
- Haak et al. (2015), Nature · Massive migration from the steppe was a source for Indo-European languages in Europedoi:10.1038/nature14317
- Lazaridis et al. (2025), Nature · The genetic origin of the Indo-Europeansdoi:10.1038/s41586-024-08531-5
Our species’ history as one day
23:32:3427 min 26 s before midnight
if the 315,000 years of Homo sapiens were compressed into a single day