Magna Carta & Aquinas: The Medieval Roots of "The King Is Under the Law"
- Jeff Kellick
- Jul 3
- 2 min read
A Lying King Sealed It. It Outlived Him by 800 Years.
In June 1215, in a wet meadow called Runnymede, a defeated King John pressed his seal to a document he had no intention of honoring. Within ten weeks he had the Pope declare it void. The charter was dead before the wax cooled — a failed peace treaty between a faithless king and a self-interested aristocracy. And yet it did not stay dead. Buried in its thirty-ninth clause was a single sentence: that the king may not seize a free man or his property except by lawful judgment or the law of the land. Eight centuries later, that sentence is the due-process clause of the American Constitution.
This is the closing episode of the series' first arc, and it does two things. It forges the medieval inheritance — Magna Carta, Bracton's "the law makes the king," Aquinas's fourfold law and his lex iniusta non est lex, the line that ran straight to Martin Luther King's Birmingham jail cell — and then it stands on the summit and looks back across the whole road: Athens, Jerusalem, Rome, and the House of Wisdom, four civilizations braided into one cord and handed to the men who would meet in Philadelphia. It reckons honestly, too, with the scandal at the center: the same Aquinas who taught universal natural law also endorsed the killing of heretics.
This is Episode 4 of "Self-Evident: The Road to 1776," a series tracing where the ideas behind the Declaration of Independence actually came from — across more than two thousand years, one civilization to the next.
The question underneath all of it: did this leave Americans more free, or more governed?
⏱️ CHAPTERS
[00:00] Prologue: Runnymede, 1215 & The Magna Carta's False Start
[03:00] Introduction: Higher Law — Medieval Foundations
[05:24] Clause 39: The King is Not Above the Law
[08:49] Henry de Bracton & The Foundation of Common Law
[13:35] MLK's Letter from Birmingham Jail and the Medieval Roots of Disobedience
[15:04] Thomas Aquinas: The Synthesis of Athens, Jerusalem, and Rome
[17:46] The Four Laws: Eternal, Natural, Human, and Divine
[21:13] Lex Injusta Non Est Lex: An Unjust Law is No True Law
[24:29] The Problem of the Tyrant and the Right of Resistance
[27:14] Marsilius of Padua: Early Outlines of Popular Sovereignty
[30:39] The Canon Lawyers: "What touches all must be approved by all"
[33:05] A Reckoning: The Moral Failures of the Medieval World
[36:32] Answering Three Historical Objections
[44:40] The Liberty Lens: Applying Clause 39 to the Modern State
[47:04] The Summit: Looking Back at the First Arc of the Golden Thread
[54:17] Preview of Episode 5 & Outro
📚 Companion:
Cites Magna Carta clause 39; Henry de Bracton; Aquinas's Summa Theologica on the fourfold law and the unjust law; Marsilius of Padua's Defensor Pacis (1324); the canon-law maxim quod omnes tangit; and King's "Letter from Birmingham Jail": https://consequentialactions.com
🎙️ Self-Evident: The Road to 1776 — Episode 4: "Higher Law — Medieval Foundations"
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Consequential Actions is a libertarian, non-interventionist analysis of American constitutional and foreign policy. New episodes weekly.
📩 Substack: https://jeffkellick.substack.com
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