 Sarah Siddons starred in John Philip Kemble 's 1794 production at the Theatre Royal , Drury Lane and offered a psychologically intricate portrait of Lady Macbeth in the tradition of Hannah Pritchard . Siddons was especially praised for moving audiences in the sleepwalking scene with her depiction of a soul in profound torment . Siddons and Kemble furthered the view established by Pritchard and Garrick that character was the essence of Shakespearean drama . 
