Definition
A common law writ — and its modern statutory successor — by which a court corrects its own judgment based on an error of fact that (1) was not known to the court at the time of judgment, (2) does not appear in the record of the original proceedings, and (3) if it had been known, would have prevented the judgment from being entered. The name derives from the Latin phrase meaning "before us," a reference to the monarch's own court — the King's Bench — which retained the record and therefore had authority to correct it.
In its original English form, coram nobis was a writ of error used within the Court of King's Bench: a judgment entered in one branch of that court could be reviewed by the full bench on the grounds that a material fact had been wrongly found or overlooked. The modern American doctrine preserves the essential mechanism — self-correction of a judgment by the rendering court — while detaching it from its narrow English procedural context and applying it almost exclusively in criminal cases where the petitioner is no longer in custody.
Common Confusion
Coram nobis is frequently confused with habeas corpus. The operative distinction is custody: habeas corpus is available only to persons currently in custody under the challenged conviction; coram nobis is the appropriate vehicle when the sentence has been fully served but the consequences of the conviction persist. A petitioner who has completed a prison term but faces collateral consequences — deportation, loss of civil rights, reputational harm — who cannot use habeas corpus may still have access to coram nobis.
Coram nobis is also confused with coram vobis. Historically, coram vobis ("before you") was the corresponding writ directed from the King's Bench to the court of Common Pleas. Bouvier's cross-references the two terms. In American practice, the distinction has collapsed: coram nobis is used generically, and coram vobis is rarely invoked.
A third confusion arises with motions for new trial based on newly discovered evidence. The key difference is the nature of the error: coram nobis addresses fundamental errors of fact external to the record that affected the court's jurisdiction or the validity of the proceeding itself, not simply new evidence bearing on guilt or innocence.
Why It Matters in Research
Coram nobis has undergone a significant functional transformation, and historical sources reflect only its narrow English form. A researcher using Black's or Bouvier's without supplementation will find a writ concerned with procedural error review between branches of the King's Bench — an accurate historical account that is nearly useless for understanding how American courts employ the doctrine today.
In American federal practice, the Supreme Court confirmed coram nobis as a live remedy in criminal cases in United States v. Morgan (1954), holding that federal courts retain authority to issue the writ under the All Writs Act. That decision is the pivot point for modern research; anything in the historical dictionaries predates it and addresses a different problem.
State practice varies considerably. Some states have abolished or superseded the writ by statute or rule; others preserve it expressly. Researchers working with pre-twentieth-century state materials should not assume the English procedural framework maps cleanly onto local practice.
The "no longer in custody" requirement is the entry gate in modern cases, and the writ carries a high burden: the petitioner must show a fundamental error of fact — courts have recognized claims based on ineffective assistance of counsel, failure to advise of immigration consequences, and mental incompetency at the time of plea, among others. This is not a general second-chance appeal mechanism, and courts treat it as extraordinary.
Corpus researchers should also note that the writ sometimes appears in civil contexts in older sources. In modern practice it is predominantly criminal, and encyclopedia and secondary sources treating it as a civil remedy are either historical or discussing rare state-law outliers.
Historical Dictionary Support
The four shelf sources are consistent and narrow. All define coram nobis by reference to its Latin root and its procedural role as a writ of error within the King's Bench. Burrill's is the most detailed, quoting the operative Latin clause — "quæ coram nobis" — that gave the writ its name by describing the record as remaining "before us." Black's and Rapalje & Lawrence add the distinction between the full bench and the court at nisi prius. Bouvier's cross-references coram vobis, which is the appropriate pointer for researchers encountering that term in English sources.
None of the historical sources engages with the writ's survival in American practice, its use by persons who have completed their sentences, or the constitutional and immigration dimensions that now dominate the case law. This is not a deficiency in the sources — they were written before the doctrine took its modern shape — but it means the historical dictionaries are useful only for understanding the writ's origins and its appearances in English procedural texts, not for contemporary legal research.
Jurisdictional Note
Federal courts recognize coram nobis under the All Writs Act, 28 U.S.C. § 1651, following Morgan. State availability varies: several states have codified post-conviction relief procedures that absorb or replace the writ, while others expressly preserve it. Researchers should check applicable state post-conviction statutes before assuming the writ is available in any given jurisdiction.
Encyclopedia Cross-Reference
Coram Nobis and Other Extraordinary Writs — The Law Mind Criminal Law Encyclopedia