<Tr> <Td> </Td> <Td> Wikimedia Commons has media related to 1400 . </Td> </Tr> <P> Year 1400 (MCD) was a leap year starting on Thursday (link will display the full calendar) of the Julian calendar . </P> <Ul> <Li> January--Henry IV of England quells the Epiphany Rising and executes the Earls of Kent, Huntingdon and Salisbury, and the Baron le Despencer, for their attempt to have Richard II restored as king . </Li> <Li> February--Henry Percy (Hotspur) leads English incursions into Scotland . </Li> <Li> February 14--The deposed Richard II of England dies by means unknown in Pontefract Castle . It is likely that King Henry IV ordered his death by starvation, to prevent further uprisings . </Li> <Li> March 23--Five - year - old Trần Thiếu Đế is forced to abdicate as ruler of Đại Việt (modern - day Vietnam), in favour of his maternal grandfather and court official Hồ Quý Ly, ending the Trần Dynasty after 175 years and starting the Hồ Dynasty . Hồ Quý Ly subsequently changes the country's name to Đại Ngu . </Li> <Li> May--Frederick I, Duke of Brunswick - Lüneburg is declared as a rival to Wenceslaus, King of the Romans . However, Frederick is murdered shortly after . </Li> <Li> August <Ul> <Li> The English occupy Edinburgh in Scotland, but fail to capture Edinburgh Castle . </Li> <Li> The princes of the German states vote to depose Wenceslaus as King of the Romans, due to his weak leadership and mental illnesses . </Li> </Ul> </Li> <Li> August 21--Rupert, Count Palatine of the Rhine, is elected as King of the Romans . </Li> <Li> September 16--Owain Glyndŵr is proclaimed Prince of Wales by his followers, and begins attacking English strongholds in north - east Wales . </Li> <Li> December--Manuel II Palaiologos becomes the only Byzantine Emperor ever to visit England . </Li> </Ul> <Li> January--Henry IV of England quells the Epiphany Rising and executes the Earls of Kent, Huntingdon and Salisbury, and the Baron le Despencer, for their attempt to have Richard II restored as king . </Li>

What was going on in the year 1400