midnight
The orchestra and the boy choir had been stationed in Saint Leonhard 's chapel . A wide door led from the consecrated chamber , spanned by a vaulted roof , into the dining-room . When it was opened , the music and singing would pour in a full flood to those seated around the board . Shortly before midnight everything in kitchen and cellar was ready for the royal couple . The wax candles and lamps were already lighted when Queen Mary prepared to bring her imperial brother to the surprise which she had planned , and whose influence she eagerly anticipated . The Emperor had received the last report half an hour before , and then commissioned his physician , who had again warned him against the excess of work , to protect him from interruption -- he desired to have an hour alone . Dr. Mathys had fulfilled this order with the utmost strictness .