<P> The Holy Roman Empire never had a capital city . Usually, the Holy Roman Emperor ruled from a place of his own choice . This was called an imperial seat . Seats of the Holy Roman Emperor included: Aachen (from 794), Munich (1328--1347 and 1744--1745), Prague (1355--1437 and 1576--1611), Vienna (1438--1576, 1611--1740 and 1745--1806) and Frankfurt am Main (1742--1744) among other cities . </P> <P> Imperial elections were mostly held in Frankfurt am Main, but also took place in Augsburg, Rhens, Cologne and Regensburg . Going as far as into the 16th century, the elected Holy Roman Emperor was then crowned and appointed by the Pope in Rome, but individual coronations also happened in Ravenna, Bologna and Reims . </P> <Table> Population of the Holy Roman Empire <Tr> <Th> Year </Th> <Th> Population </Th> <Th> Ref . </Th> </Tr> <Tr> <Th> 1500 </Th> <Td> 16,000,000 </Td> <Td> </Td> </Tr> <Tr> <Th> 1618 </Th> <Td> 21,000,000 </Td> <Td> </Td> </Tr> <Tr> <Th> 1648 </Th> <Td> 16,000,000 </Td> <Td> </Td> </Tr> <Tr> <Th> 1786 </Th> <Td> 26,265,000 </Td> <Td> </Td> </Tr> <Tr> <Th> 1800 </Th> <Td> 24,000,000 </Td> <Td> </Td> </Tr> </Table> <Tr> <Th> Year </Th> <Th> Population </Th> <Th> Ref . </Th> </Tr>

When did the holy roman empire begin apex