Holy Roman Emperor
Monarchical
The Holy Roman Emperor, originally and officially the Emperor of the Romans during the Middle Ages, and also known as the Roman-German Emperor since the early modern period, was the ruler and head of state of the Holy Roman Empire. Wikipedia
Past holders: Charlemagne, Charles V, Frederick Barbarossa, and more
First monarch: Charlemagne (AD 800 formation); Otto the Great (AD 962 formation)
Formation: 25 December 800