The modern unicorn is depicted as a white horse with a long spiral golden or white horn on its forehead. This was not always the case. In the Middle Ages, the unicorn was considered to be 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 cloven hooves. It was a symbol of purity and loyalty and was regarded as untameable.