The Treason Act 1351 – One of Britain’s Oldest Laws

Portrait of king edward the third to show that the origins of the law come from him when he was in charge. This is to the treason act of 1351 UK Law.

Introduction

The Treason Act 1351 is one of the oldest laws still partly in force in the UK. Created during the reign of King Edward III, it defined treason for the first time in English law. And many of its principles still influence national security laws today.

What Does the Law Say?

The original Act made it a crime of high treason to plot or attempt to kill the King, Queen, or their eldest son and heir, to wage war against the Crown, or to assist the monarch’s enemies. Punishments were severe, often involving execution.

Why Was It Introduced?

In the turbulent 14th century, the monarchy faced constant threats from rival claimants, rebellions, and foreign powers. The Act was designed to clearly define what counted as treason so it could be prosecuted more consistently.

Is the Law Still Enforced?

Yes, although the death penalty for treason was abolished in 1998, the offence itself still exists. Modern treason cases are extremely rare, but the law has been cited in trials involving terrorism or attempts to harm the monarch.

Fun Fact

Until 1814, being convicted of high treason often involved the gruesome punishment of being hanged, drawn, and quartered.

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