A staple trope in fantasy and indeed European folklore is a race of short humans, usually fond of mining; these mythical creatures are usually spelt dwarves after Tolkien. They do not exist in real life.
A smaller number of fantasy works, most notably A Song of Ice and Fire, feature ‘dwarfs’, that is to say human beings who through a genetic condition are of short stature. Obviously, there are many people with dwarfism in the real world!
What is the first work of fantasy to feature both a mythical race of dwarves and a human being with dwarfism?