No other creature captures the imagination of the medieval bestiary better than the unicorn. What is described as a horned horse is in fact a beast of immense power and beauty. Almost always described as a pure white stallion with a majestic horn, in medieval Europe the unicorn was an important symbol of Christ—a pure and powerful creature that was betrayed, captured and sacrificed. It is believed the unicorn was a Christian adaptation of the Celtic white stag, which represented the power of nature and was an avatar of the gods.
Known to live in the forests of Europe, the unicorn was so formidable a beast with its slashing horn that hunters with spears and hounds could not bring it down. Though an herbivore, the unicorn was feared to be as dangerous a woodland creature as the wild boar. It was believed that the power of the unicorn was contained within its horn, which was prized for its medicinal qualities. The unicorn’s weakness, however, was that the purity and goodness of a maiden could tame it like a puppy. Hunters used maidens as bait to lure and trap unicorns to be slain. According to medieval bestiaries and illustrations, the unicorn is about the size of a pony or deer, not a full-sized horse. A second distinction from the horse is its cloven, goatlike hooves and distinctive goatee and tail. It is possible that the unicorn was a wild woodland species of the Caprinae family. Contemporary historians have suggested that rare narwhal horns from the north gave rise to the legend of the unicorn. The United Kingdom to this day employs the symbols of the lion and the unicorn on its coat of arms.