There was a hierarchical system in the Middle Ages of Western Europe, and the aristocratic hierarchy was an important part of the medieval society. The titles of the aristocracy in Western Europe were not uniformly formulated and issued by a monarch or political authority in a certain period, but existed in a process of gradual development and evolution. Title is a mark to classify the aristocracy, which can reflect the status of aristocracy more comprehensively, clearly and directly than knighthood, clothes, heraldry. It is very important to systematize and summarize the titles of the nobility for further understanding of the history and culture of the Middle Ages in Western Europe, especially the aristocratic culture.