This is insanely speculative and baseless. Historical records aren't the only thing these estimates are based on. Pre domesticated horses were too small to be ridden like modern horses are, and the increase in size necessary to be ridden is evident in horse remains.
mithradatdeez t1_jb6ga26 wrote
Reply to comment by [deleted] in Humans Started Riding Horses 5,000 Years Ago, New Evidence Suggests by geoxol
This is insanely speculative and baseless. Historical records aren't the only thing these estimates are based on. Pre domesticated horses were too small to be ridden like modern horses are, and the increase in size necessary to be ridden is evident in horse remains.