How did the Habeas Corpus Act of 1679 connect to clause 39 of Magna Carta?

The Habeas Corpus Act of 1679 is fundamentally connected to clause 39 of the Magna Carta (1215) as both serve as foundational pillars for the protection of individual liberty against arbitrary state power.1

Clause 39 established the principle that no free person shall be imprisoned, arrested, or otherwise victimized except by the "lawful judgment of his peers or by the law of the land". This provision is widely recognized as the origin of due process in Anglo-American jurisprudence.1

In the 17th century, legal advocates and Parliament looked directly back to this clause to challenge the crown’s discretionary power of arrest. The Habeas Corpus Act of 1679 codified these protections by providing the procedural mechanisms—such as authorizing judges to issue writs even during court vacations—necessary to enforce the right to due process. By ensuring that detainees could challenge the validity of their imprisonment before a court, the Act transformed the general promise of liberty found in the Magna Carta into an effective, enforceable legal remedy.1234