Scriptural Resonance: Deuteronomy 17:18–19 — “And when he sits on the throne of his kingdom, he shall write for himself in a book a copy of this law… that he may learn to fear the Lord his God.”

Definition: Latin for “The Law is King.” A constitutional principle asserting that rulers are subject to law, not above it.

Theological Use: Rooted in Samuel Rutherford’s 1644 treatise *Lex, Rex*, this concept affirms that civil authority is derived from God and mediated through law. It counters the divine right of kings and supports covenantal accountability.

Pastoral Note: Lex Rex reminds us that leadership is stewardship. Whether in church or state, authority must be exercised under God’s law, not personal whim. It safeguards liberty by anchoring power in righteousness.