Hundreds of years ago, Orcs swept into the eastern fringes of Europe. The great Orc Khans invaded the lands of the Rus' and pushed deeper into the kingdoms of Poland and Hungary, eventually painting a path of destruction all the way to Dalmatia and the coast of the Adriatic. This was a dark time for the enlightened people of Europe who fought the Orcish Khans and their Golden Horde.
Eventually, the righteous prevailed in pushing the Golden Horde back and ending the Orcish influence on the eastern reaches of Europe. However, the legacy of the Golden Horde did not perish so easily. The remnants of the Golden Horde broke into a number of Khantes who still hold sway to this day. While the host of Orcs have been pushed back towards their ancestral home and into Mongolia, their taint remains in the form of the Crimean Khanate and in the bloodlines of Half-Orcs today.
Orcs are mostly absent from present day Europe as the Golden Horde collapsed. Their legacy lives on in the Crimean Khanate. As a protectorate of the Ottoman Empire, Half-Orcs continue to raid Russian and Polish lands. Outside of Crimea, Half-Orcs do not hold any major dominions and are instead interspersed within the populations of the old Golden Horde conquests.