Definition
The Register of Writs was an official compilation maintained in the English Court of Chancery recording the approved forms of original and judicial writs available to litigants seeking relief at common law. It served as the authoritative catalog of recognized writs — each writ being a formal written command issued in the king's name that initiated or advanced a legal proceeding. To bring a claim at common law, a plaintiff was required to fit his grievance into an existing writ form; if no appropriate form existed in the Register, the claim generally could not proceed in the common law courts.
The Register was not a statute or a judicial opinion. It was a practical working document of the Chancery, accumulated over time as new writ forms were authorized and entered. Its authority derived from long usage and judicial recognition rather than from any single act of Parliament, though the Statute of Westminster II (1285) gave Chancery clerks limited authority to create new writs in cases similar to those already covered — the so-called "in consimili casu" provision that allowed modest extension of the Register's contents.
Why It Matters in Research
The Register of Writs is foundational context for understanding the entire architecture of classical English common law procedure. Researchers working in pre-19th-century English legal sources will encounter frequent references to whether a writ "lay" for a given set of facts — a question answered directly by reference to the Register. The rigidity of the writ system explains why so much early common law development consisted of arguing about writ selection and amendment rather than substantive rights.
Several research traps apply. First, the Register must be distinguished from the Registrum Brevium, which is the printed version of essentially the same compilation. When early sources cite "the Register" or "the Registrum," they are pointing to the same tradition, but the printed text (first published under Henry VIII) was the version actually in circulation for most of the common law period. Second, the Register has no American counterpart — American jurisdictions inherited common law substance but largely displaced the writ system through codes of civil procedure beginning with the New York Field Code of 1848 and accelerating through the Federal Rules of Civil Procedure (1938). References to the Register in American sources are almost always historical, not operative. Third, researchers tracing the origins of specific causes of action — trespass, case, assumpsit, trover — will find the Register indispensable as background, because each action was defined by its founding writ form. The evolution of common law pleading cannot be understood without it.
The Register also connects directly to equity jurisdiction. When the common law writ system failed to provide a remedy, litigants petitioned the Chancellor directly, which is a principal historical driver of equity's growth as a parallel system. Understanding what the Register did and did not cover clarifies why equity developed as it did.
Historical Dictionary Support
Black's Law Dictionary and Bouvier's Law Dictionary are in agreement on the basic description: the Register was a book preserved in the English Court of Chancery containing the forms of original and judicial writs. Bouvier adds significant depth, identifying the Register as "one of the most ancient books of the common law" and noting its connection to the Statute of Westminster II. Bouvier's citation chain — Coke on Littleton, Coke's Fourth Institutes, and Blackstone's Commentaries — reflects the standard scholarly lineage through which the Register was discussed in the classical treatise tradition.
Bouvier's fragment that the Register "is still an authority, as containing" is unfortunately cut short in the available text, but the intended completion is well-established in the broader literature: the Register remained authoritative as a record of recognized writ forms even after the active use of those forms had diminished, because courts continued to reason from the historical categories it established. Coke's Fourth Institutes and Blackstone's Commentaries (Book III) both treat the Register as foundational to understanding common law procedure.
What the historical dictionary entries do not address is the Register's downstream significance for American law — understandably, since both Black's and Bouvier's are writing from within the common law tradition. American researchers should be aware that the Register's relevance in domestic sources is almost entirely retrospective and doctrinal rather than procedural.
Jurisdictional Note
The Register of Writs is an institution of English law with no direct American equivalent. American procedural law abolished the formal writ system through 19th- and 20th-century code pleading reforms, and references to the Register in American courts appear only when tracing the historical origins of a cause of action or a common law doctrine.
Encyclopedia Cross-Reference
Coram Nobis and Other Extraordinary Writs — The Law Mind Criminal Law Encyclopedia (criminal_240): For the surviving writ forms that persisted beyond the abolition of the general writ system.
Habeas Corpus — The Great Writ and Suspension Clause — The Law Mind Constitutional Law Encyclopedia (constitutional_151): For the most significant writ to survive into modern law in its original form.