Layer Two: Steppe

Layer Two. Today's Iranian is not a race. It is a layering. In the previous episode we saw that the first layer was the Zagros farmer, around 8000 BCE, on this same plateau. This episode is about layer two: the steppe. Ancient-DNA studies on 523 ancient genomes find Yamnaya-derived steppe ancestry layered into modern Iranians, added to the plateau roughly 2000-1500 BCE (Narasimhan et al., 2019). This layer didn't only bring genes. They brought the riding horse. And the riding horse was domesticated on those same plains, by the end of the third millennium BCE (Librado et al., 2021). The spoked wheel, around 2000 BCE, at Sintashta. And language: modern Persian belongs to the Indo-Iranian family, not to its Semitic neighbours. It was not a replacement. It was a merger. And the merger is what we read in the DNA, hear in the language, and see in our faces. The rider came down from the steppe. The Zagros farmer stayed put. From their meeting, not a race but a homeland. The steppe people were themselves a genetic mosaic. Not a pure race, not a single people. Nowhere in this story, at no point in this thousands-of-years history, is there a 'purity' worth defending. The merging is not our weakness. It is our strength. Next episode: layer three. Empire, bureaucracy, and the thing that got carved into stone as the name 'Iran'. References: Narasimhan VM et al. (2019), Science 365 — formation of human populations in South and Central Asia (n=523 ancient genomes). Librado P et al. (2021), Nature 598 — origins and spread of domestic horses from the Western Eurasian steppes.#Iran #IranianDNA #AncientDNA #Steppe #IndoEuropean #Mihan