<Table> Victorian era <Tr> <Td_colspan="2"> 1837--1901 </Td> </Tr> <Tr> <Td_colspan="2"> Queen Victoria by Bassano (1887) </Td> </Tr> <Tr> <Th> Preceded by </Th> <Td> Regency era </Td> </Tr> <Tr> <Th> Followed by </Th> <Td> Edwardian era </Td> </Tr> <Tr> <Th> Monarch </Th> <Td> Victoria </Td> </Tr> <Tr> <Th> Leader (s) </Th> <Td> <Ul> <Li> Lord Melbourne </Li> <Li> Sir Robert Peel </Li> <Li> Lord John Russell </Li> <Li> Lord Derby </Li> <Li> Lord Aberdeen </Li> <Li> Lord Palmerston </Li> <Li> Benjamin Disraeli </Li> <Li> William Ewart Gladstone </Li> <Li> Lord Salisbury </Li> <Li> Lord Rosebery </Li> </Ul> </Td> </Tr> </Table> <Tr> <Td_colspan="2"> 1837--1901 </Td> </Tr>

What are the beginning and the ending years of the victorian period