1. A king who broke his own bargains
John taxed heavily, punished enemies without trial, and manipulated royal justice for profit. His defeats in France and quarrels with the Church left him short of money and allies, and his barons increasingly saw him as untrustworthy.
Why it matters: The charter was a response to a specific, distrusted ruler, not an abstract theory of freedom. Its bite came from concrete abuses that powerful men had personally suffered.