The original story of Turandot is centred on the epic works of the 12th century Persian poet, Nizani, based on Turad-Dokht (daughter of Turan).  This was Puccini’s last opera and in fact he never completed the third Act at the time of his death in 1924.  The ending of this opera was completed by Alfano, based on sketches left behind by Puccini.  The original premier of Turandot was held in Milan in 1926 and conducted by Toscanini.  Luciano Berio was also sanctioned to make a new completion for the opera, but this is rarely performed.