The 1215 Document That Still Shapes How Governments Are Held to Account

On 15 June 1215, King John of England sealed Magna Carta at Runnymede, a meadow along the River Thames chosen as neutral ground between his forces and the rebellious barons. Years of heavy taxation, failed military campaigns and disputes with the Pope had pushed England’s nobility toward open revolt. The resulting charter was not legislation in any modern sense — it was a negotiated settlement attempting to bind a monarch to a written set of rules.

The Clause That Outlasted The Rest

Most of Magna Carta’s 63 original clauses addressed narrow, feudal-era concerns that became irrelevant over time — only three remain in force in England and Wales today. But Clause 39, which barred imprisonment except by lawful judgment of one’s peers or the law of the land, was later invoked in support of habeas corpus — the right to challenge unlawful imprisonment — and of trial by jury, institutions that took shape in later centuries.

The document’s larger significance lies in a single governing principle it established: that even a king was not above the law. As the US National Archives puts it, this was “a milestone in constitutional thought for the 13th century and for centuries to come.”

A Charter That Keeps Getting Reinvoked

Magna Carta’s influence reaches directly into the US Bill of Rights — the Fifth Amendment’s due process clause traces back to Clause 39’s “law of the land” guarantee — and it remains a recurring political touchstone in Britain itself. Its 800th anniversary in 2015 saw it invoked on opposite sides of a live constitutional debate, with some politicians citing it in support of a British Bill of Rights and others warning against using its legacy to justify repealing existing human rights protections. That tension — between Magna Carta as founding myth and Magna Carta as living legal principle — is, arguably, part of what has kept it politically relevant for eight centuries.

Key Insights

• Magna Carta was sealed by King John at Runnymede on 15 June 1215, following a baronial revolt.
• Only three of its 63 clauses remain in force in England and Wales today.
• Clause 39’s protection against arbitrary imprisonment was later invoked in support of habeas corpus.
• The US Fifth Amendment’s due process clause traces back to Magna Carta’s Clause 39 (“law of the land”).