All of us alive today. I believe they bred with the moderns and we are the consequence.
I suspect there are Neanderthal genes in Europeans but not in Africans or Australians. Lot of Europeans have the body shape (stocky), head shape (long and narrow) and receding chin suggestive of Neanderthal genes. However the "experts" say that the Neanderthal DNA is incompatible with homo sapien.
BTW those horses are magnificent.
An experiment gone wrong? ;-)