Although not all minstrel depictions of Uncle Tom were negative, the dominant version developed into a stock character very different from Stowe's hero.   Stowe's Uncle Tom was a muscular and virile man who refused to obey when ordered to beat other slaves; the stock character of minstrel shows became a shuffling asexual individual with a receding hairline and graying hair.  To Jo-Ann Morgan, author of Uncle Tom's Cabin as Visual Culture , these shifting representations undermined the subversive layers of Stowe's original characterization by redefining Uncle Tom until he fit within prevailing racist norms.  Particularly after the Civil War, as the political thrust of the novel which had arguably helped to precipitate that war became obsolete to actual political discourse, popular depictions of the title character recast him within the apologetics of the Lost Cause of the Confederacy .  The virile father of the abolitionist serial and first book edition degenerated into a decrepit old man, and with that transformation the character lost the capacity for resistance that had originally given meaning to his choices.   Stowe never meant Uncle Tom to be a derided name, but the term as a pejorative has developed based on how later versions of the character, stripped of his strength, were depicted on stage. 
Other possible sources are the anonymous play King Leir (published in 1605); The Mirror for Magistrates (1574), by John Higgins; The Malcontent (1604), by John Marston ; The London Prodigal (1605); Montaigne 's Essays , which were translated into English by John Florio in 1603; An Historical Description of Iland of Britaine (1577), by William Harrison ; Remaines Concerning Britaine (1606), by William Camden ; Albion 's England (1589), by William Warner ; and A Declaration of egregious Popish Impostures (1603), by Samuel Harsnett , which provided some of the language used by Edgar while he feigns madness. King Lear is also a literary variant of a common fairy tale , Love Like Salt, Aarne–Thompson type 923, in which a father rejects his youngest daughter for a statement of her love that does not please him.