Frankfurt is a city in the German state of Hesse. Resting on the banks of the Main River, the city is the fifth-largest in Germany and it boasts a population of 648,325 inhabitants. This historical city was the electoral city for the Emperors of the Holy Roman Empire of the German Nation between 855AD and 1792AD. During the revolution of 1848-49, Frankfurt was the chosen revolutionary capital and it was also the seat of Germany