Holy Roman Emperor Frederick II was one of the most powerful monarchs of the medieval era, renowned for his military prowess and political acumen. As a result, there are a number of synonyms and titles that have been used to refer to him throughout history. Some of the most common include "Frederick II the Great," "Frederick the Stupor Mundi," and "Frederick the Wonder of the World." Additionally, he was often referred to simply as the "Emperor" or "King of Sicily." Regardless of the name or title used, however, there is no denying the profound impact that Frederick II had on European history, and his legacy continues to be felt to this day.