 The narrator explains that all of Henry IV 's rebellious enemies had been killed by 1408 , but that Henry 's health has begun to deteriorate . At the castle , Henry becomes upset when told that Hal is once again spending time with Falstaff , and collapses . Hal visits the castle and discovers that Henry is sicker than he had realized . Hal vows to Henry to be a good and noble king . Henry finally has faith in Hal and advises him on how to be a king . Henry dies and Hal tells his men that he is now King Henry V. 
