<Tr> <Th> Role </Th> <Th> Voice type </Th> <Th> Premiere cast, 25 April 1926 (Conductor: Arturo Toscanini) </Th> </Tr> <Tr> <Td> Princess Turandot </Td> <Td> soprano </Td> <Td> Rosa Raisa </Td> </Tr> <Tr> <Td> The Emperor Altoum, her father </Td> <Td> tenor </Td> <Td> Francesco Dominici </Td> </Tr> <Tr> <Td> Timur, the deposed King of Tartary </Td> <Td> bass </Td> <Td> Carlo Walter </Td> </Tr>

What is the story of the opera turandot