1215, a government document was written by English nobles to limit the kings power because they felt that he was taking their power away so they made a document that the king was focus to sign that would make the king have to listen to all the rules.
Now that the Magna Carta has been put in place the king cant do what ever he wants any more.
your majesty you cant come down here without paying, remember.
Yaaaaaay! Now the king cant just be unfare and heavy handed when ever he wants. Sence the king has less power now the nobles and citizens will regain power.