Konik
The Konik (Polish: konik polski or konik biłgorajski) or the Polish primitive horse is a pony breed from Poland that lives semi-feral in some regions.
The breed is descending from very hardy horses from the Biłgoraj region. These horses had a predominantly dun colour, but also black and chestnut horses were present in the population. Some researchers claim these foundation animals were hybrids with wild horse breeding that had been sold to farmers by the zoo in Zamość in 1806, which were bred to local domesticated draft horses. However, genetic studies now contradict the view that the Konik is a surviving form of Eastern European wild horse, commonly called the tarpan, nor is it closely related to them. The Konik shares mitochondrial DNA with many other domesticated horse breeds and their Y-DNA is nearly identical.
Read more at Wikipedia entry, which is the source of the above.