Magna Carta established the principle of law above the King.

Evidence

Throughout the document it is implied that here is a law which is above the King and which even he must not break. This reaffirmation of a supreme law and its expression in a general charter is the great work of Magna Carta; and this alone justifies the respect in which men have held it. — Winston Churchill, A History of the English-Speaking…, 398

Categorization

• corroborated: 2 independent passages support this claim — Winston Churchill, A History of the English-Speaking…, 398
• XREF: connects to: The root principle of law above the King has enduring significance. — Winston Churchill, A History of the English-Speaking…, 399; The right to petition dates back 800 years to the Magna Carta. — Interpretation: Right to Assemble and Petition; Noblesse oblige makes every moment of the noble fixed by law — Georg Simmel, on individuality and social forms_…, 495 (+6 more)