A comparison of King Lear and George North's “Discourse,” especially fols 35v–37, once again suggests a relationship between North's writing and Shakespeare's. Indeed, North's conflating of a prophecy by Merlin with a description of role-reversals in a topsy-turvy world offers a primary example of King Lear's debt to the earlier text. “Discourse” may even have provided the basis for the character of the Fool, who quotes Merlin explicitly, emphasizing the sixth-century Prophet with whom he has much in common. Or, to be more precise, Lear's Fool resembles the peculiar version of Merlin described in “Discourse.” Moreover, North's poems on the hunted and famished rebels, Glendower and Cade, figured in the crafting of the hunted and famished Poor Tom. Many of Jack Cade's lines in “Discourse” also appear in King Lear, and they are frequently associated with Poor Tom.

The following excerpt is just one example of the myriad descriptions in King Lear of a world turned upside-down:

With Lear's imagining of a thief playing a justice and a dog commanding a beggar, we see allusions to Jack Cade and Edgar/Poor Tom. In the English history play, Cade, the commoner rebel and thief, switches places with Lord Say, a fair and noble justice: Cade, the play's force for chaos, sits in judgment of Say, and his verdict is beheading. Similarly, in King Lear, when the desperate, pursued, and starving Edgar disguises himself as Poor Tom, he witnesses Lear's mad trial, playing the role of a “learnèd justicer” (3.6.21), though, of course, Edgar's noble impulses remain. William C. Carroll is one of many scholars who have emphasized the resemblances between Cade and Poor Tom, including in this scene: