The Magna Carta
The Magna Carta, or "Great Charter," affirmed that everyone is subject to the law -- even the king. It was an agreement between King John and the nobility in 1215, but its listing of rights provided instrumental founding principles for the wider establishment of rights for all citizens in the centuries following -- including the rights guaranteed in the Constitution of the United States.
One branch of government can check the other through the usage of "Checks and Balances", which states that no one branch can become to powerful, as the others have the right to suppress the other branch's power.
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Ideology of conservatism.
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