<Tr> <Th> Government </Th> <Td> Elective monarchy Later also hereditary </Td> </Tr> <Tr> <Th> Great Khan </Th> <Td> </Td> </Tr> <Tr> <Th> 1206--1227 </Th> <Td> Genghis Khan </Td> </Tr> <Tr> <Th> 1229--1241 </Th> <Td> Ögedei Khan </Td> </Tr>

Who were the mongols and how did they come under one ruler