The Holy Roman Empire was a union of territories in Central Europe during the Middle Ages.
The first emperor of the Holy Roman Empire was Otto I, crowned in 962 CE. The last was Francis II who abdicated and dissolved the Empire in 1806 during the Napoleonic Wars.
It had been officially known as the Holy Roman Empire of the German Nation.
Notwithstanding its name, for most of its history it did not incorporate Rome within its boundaries.