Zombies in History
Within reason, anything goes. Everyone knows fantastic and dangerous creatures exist, from kraken in the oceans to red dragons in the high parts of Wales. In more urbanized areas, those creatures are much more rare. In England, for example, animals as benign as wolves have been hunted nearly to extinction for sport. One can’t expect to find dragons or griffons there. However, no one really knows what lives under the Alps or atop the Eiger Norwand, and people can only guess what the strange hides and tusks flowing into the trading centers of the Byzantine Empire from uncivilized points north and east come from…
There are no orcs. They are made up fantasy monsters. Goblins are ok though.