The modern unicorn is depicted as a white horse with a long, spiral golden or white horn emerging from its forehead. This was not always the case. In the Middle Ages, the unicorn was the size of a donkey or a goat. It was white but had the head of a deer, the body of a horse, the tail of a lion, the beard of a goat, and hooves. It was a symbol of purity and fidelity and was considered untameable.