Madness in King Lear: Act 4 In Shakespeare's play King Lear, Shakespeare introduces many themes. The most important theme shown in King Lear is the theme of madness. During the course of this play madness is shown in the tragic hero, King Lear. King Lear develops madness right in the beginning of the play but he actually shows it in Act 4. In this act, King Lear is not only at the peak of madness but it is also shown him coming out of his madness as well. This act is likely to be the most important act because it shows the phases King Lear goes through, from complete madness to him coming out of his madness and reali