Short answers, pulled from the story.
The Yamnaya culture was a late Copper Age to early Bronze Age society occupying the Pontic-Caspian steppe, the region between the Southern Bug, Dniester, and Ural rivers, dating from approximately 3300 to 2600 BC. It is also known as the Pit Grave culture or Ochre Grave culture. Research has identified Mykhailivka, on the lower Dnieper River in Ukraine, as the core of the culture, with occupation there dating to around 3600-3400 BC.
Vasily Gorodtsov discovered the Yamnaya culture following archaeological excavations near the Donets River between 1901 and 1903. He defined the culture to differentiate it from the Catacomb and Srubnaya cultures, which occupied the same region but were considered to belong to a later period.
A 2022 study by Lazaridis et al. found the typical Yamnaya phenotype was brown eyes, brown hair, and intermediate skin colour. None of the Yamnaya samples in that study were predicted to have blue eyes or blond hair. Genetically they are best described as a mixture of Eastern European Hunter-Gatherers and Caucasus Hunter-Gatherers, with more recent 2025 modelling placing roughly 80% of their ancestry from a Caucasus-Lower Volga population.
The widely accepted Kurgan hypothesis, associated with Marija Gimbutas, identifies the Yamnaya with the late Proto-Indo-Europeans. David Anthony has argued the Pontic-Caspian steppe is the strongest candidate for the original homeland of the Proto-Indo-European language. The hypothesis is supported by genetic and linguistic evidence but remains debated, with Colin Renfrew arguing for a Near Eastern origin instead.
Yamnaya-related ancestry in modern Central and Northern Europeans ranges from roughly 38.8% to 50.4%, while in Southern Europeans it ranges from about 18.5% to 32.6%. Finland has the highest Yamnaya contribution in Europe at about 50.4%. Sardinians carry between approximately 2.4% and 7.1%, and Sicilians between about 5.9% and 11.6%.
The Corded Ware culture, the Bell Beaker culture, and the Sintashta and Andronovo cultures all derived large parts of their ancestry from the Yamnaya or a closely related population. Yamnaya material culture was also very similar to the Afanasievo culture of southern Siberia, and both populations are genetically indistinguishable. The Yamnaya were succeeded in their western range by the Catacomb culture, dating from about 2800 to 2200 BC, and in the east by the Poltavka culture on the middle Volga.