<Tr> <Td> Daughter of Emperor Xiaoming of Northern Wei </Td> <Td> China </Td> <Td> Northern Wei </Td> <Td> 1 April 528 </Td> <Td> 1 April 528 </Td> <Td> Less than 5 hours </Td> <Td> Soon after her birth, her grandmother, the Empress Dowager Hu, falsely declared she was a boy and ordered a general pardon . Emperor Xiaoming died soon afterwards . On 1 April 528, Empress Dowager Hu installed the infant on the throne for a matter of hours before replacing her with Yuan Zhao the next day . </Td> </Tr> <P> Due to the ephemeral nature of his reign, the following has been disputed as a genuine monarch: </P> <Table> <Tr> <Th> Name </Th> <Th> Country </Th> <Th> Royal house / dynasty </Th> <Th> Reign began </Th> <Th> Reign ended </Th> <Th> Length </Th> <Th> Comments </Th> </Tr> <Tr> <Td> Prince Louis Antoine, Duke of Angoulême, "King Louis XIX" </Td> <Td> Kingdom of France </Td> <Td> Bourbon </Td> <Td> 2 August 1830 </Td> <Td> 2 August 1830 </Td> <Td> 20 minutes </Td> <Td> Succeeded with the abdication of his father, Charles X, only to himself abdicate in favour of his nephew, Henry V (above). The question of whether Louis actually "reigned" is a philosophical one, as after his father signed the document of abdication, he contemplated his future for twenty minutes before himself signing . Many Legitimists did not recognise the abdications as valid, and recognised Charles X as king until his death in 1836, before recognising Louis as king until his own death in 1844 . </Td> </Tr> </Table> <Tr> <Th> Name </Th> <Th> Country </Th> <Th> Royal house / dynasty </Th> <Th> Reign began </Th> <Th> Reign ended </Th> <Th> Length </Th> <Th> Comments </Th> </Tr>

Who had the shortest reign of a monarch 20 minutes