The title of "Holy Roman Emperor" was held by the ruler of the Holy Roman Empire, a complex political entity in Central Europe that existed from the early Middle Ages until 1806. The emperor was considered the secular counterpart to the Pope and was often involved in religious matters, reflecting the close relationship between the church and state during this period. The position was not hereditary; instead, it was elected by a group of prince-electors. Notable emperors include Charlemagne, who was crowned in 800 AD, and Frederick Barbarossa. The empire played a significant role in European history, influencing politics, culture, and religion.