twelve o’clock
` It is impossible , ' said Mr. Rigby . ` I do n't think I can be mistaken , ' said the Duke , smiling . ` I will show your Grace that it is impossible , ' said Mr. Rigby , ` Lord Lyndhurst slept at Wimbledon . Lord Grey could not have seen the King until twelve o'clock ; it is now five minutes to one . It is impossible , therefore , that any message from the King could have reached Lord Lyndhurst in time for his Lordship to be at the palace at this moment . ' ` But my authority is a high one , ' said the Duke . ` Authority is a phrase , ' said Mr. Rigby ; ` we must look to time and place , dates and localities , to discover the truth . '