What happens
York and his sons force their way into Parliament, backed by Warwick's soldiers. Henry reluctantly agrees to name York his heir, disinheriting his own son Prince Edward. Queen Margaret arrives, furious at Henry's weakness, and denounces the treaty as a betrayal. She declares herself his enemy and vows to fight to restore her son's birthright, leaving the stage in rage while Henry remains helpless.
Why it matters
This opening scene establishes the play's central conflict: the collision between inherited law and raw military power. York arrives not to negotiate but to seize, his soldiers already positioned and his demands framed as both righteous claim and military fait accompli. Henry's capitulation—trading his son's future for temporary peace—reveals him as incapable of holding power through force or conviction. The scene pivots on Henry's fateful agreement in line 90: 'Richard Plantagenet, Enjoy the kingdom after my decease.' This is not a genuine compromise but a cave-in, and the stage immediately fills with voices telling him so. Clifford, Northumberland, and Westmoreland recognize the betrayal instantly and storm out, transforming the scene from a power grab into a declaration of war.
Margaret's entrance transforms everything. Where Henry speaks of virtue and mercy, she speaks of blood and iron, and her response to his weakness is not acceptance but war. Her long speech—part prophecy, part curse—establishes her as the play's moral center even as she becomes its engine of vengeance. She will not be reconciled; she will not accept her son's disinheritance. By the scene's end, Henry has lost both the throne in fact (York sits in it) and his wife's loyalty. The treaty he thought would bring peace has instead fractured every bond—between king and nobles, between husband and wife, between father and son. The stage empties with Henry alone and diminished, already prophesying the chaos his own surrender has unleashed.