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Taming and domestication were not single events. They were a slow, stop-start process, full of setbacks, playing out over generations and across vast regions, before full domestication set in shortly before 2000 BCE.

"Horses were already being used in sophisticated, widespread ways before we could pin down full domestication. That gap reshapes how we understand human history," says

Professor Volker Heyd, co-lead author of the research.

“The role of horses in major historical developments is almost too vast to measure, hence the saying that the world was conquered on horseback,” Heyd says.