Definition
The Mirror des Justices (also rendered Mirror of Justices) is a medieval legal treatise written in Anglo-Norman French, long regarded as a significant — if deeply unreliable — source on early English law. Attributed by tradition to Andrew Horne, a London fishmonger and city chamberlain who died in 1328, the text purports to describe the law and judicial customs of Anglo-Saxon and early Norman England, including accounts of courts, judicial officers, and criminal procedure. It is consulted primarily as a historical artifact rather than as authoritative legal exposition, and its numerous demonstrable fabrications have made it a cautionary example in the use of medieval legal sources.
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Common Confusion
The Mirror des Justices is sometimes loosely grouped with genuine foundational common law treatises such as Glanvill, Bracton, and Britton. This conflation overstates the Mirror's authority. Unlike those works, which are regarded as serious legal authorities despite their age and imperfections, the Mirror was recognized as anomalous even by historical standards. Scholars have identified wholesale inventions within the text, including fictitious statutes, fabricated accounts of Saxon kings hanged for judicial misconduct, and institutions with no corroboration in any other medieval source. It is a primary source for the history of legal writing and medieval legal imagination — not a reliable guide to what the law actually was.
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Why It Matters in Research
Researchers encounter the Mirror des Justices most often in one of three contexts: the history of English legal literature, debates over common law origins, and the work of F. W. Maitland.
Maitland's engagement with the Mirror is the critical modern anchor. In his 1895 edition of the text (published for the Selden Society), Maitland subjected the treatise to rigorous scrutiny and concluded that it is riddled with inventions — that the Mirror's author, whoever he was, constructed a fictional legal history rather than recorded an actual one. Maitland also cast doubt on the traditional attribution to Horne, finding the evidence inconclusive. Any researcher using the Mirror must engage with Maitland's Selden Society edition and introduction, which remains the standard scholarly treatment.
The authorship question itself has research implications. The older view — reflected in Bouvier and in earlier legal bibliographies — held that the germ of the work predated the Norman Conquest and that Horne merely added to it. Maitland rejected this. The current scholarly consensus follows Maitland: the treatise dates to the late thirteenth or early fourteenth century and is a product of that period's legal culture, not a transmission of pre-Conquest custom.
For corpus researchers working in early common law materials, the Mirror appears in footnotes and commentaries as a source cited with notable skepticism. Early American legal writers occasionally referenced it as part of the standard catalog of English legal antiquities, but without treating it as authoritative. When it appears in nineteenth-century American legal texts, the citation is almost always to the effect that English law once held such-and-such — traced back through Blackstone or other secondary reporters — not a direct reliance on the Mirror itself.
Researchers should also note the Anglo-Norman language of the original. The title itself is Anglo-Norman French (miroir des justices), not Latin, distinguishing it from most other medieval legal texts in the standard canon. This can cause confusion in catalog searches and bibliographic references, where the work appears under both the French title and its English translation.
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Historical Dictionary Support
Bouvier's entry is brief and accurate in its outline but cuts off before completing its account of Maitland's conclusions. The fragment preserved in the source material captures the essential tension — older opinion attributing ancient origins to the text, Maitland's contrary view — but does not resolve it. Bouvier reflects the nineteenth-century bibliographic tradition, citing Marvin's Legal Bibliography (Marv. Leg. Bibl. 396) as the supporting reference for the older view of composite authorship.
No other historical dictionary entry is available for cross-reference in this entry's source set. The absence is itself instructive: the Mirror des Justices was not a term of practical legal art requiring definition in a working lawyer's dictionary. Its appearance in Bouvier belongs to the tradition of legal bibliography rather than doctrine, a record of what lawyers were expected to know existed rather than what they were expected to apply.
The scholarly literature beyond the dictionaries is more substantive. Maitland's 1895 Selden Society edition (Volume 7) is the essential reference. William Holdsworth's History of English Law also addresses the Mirror, characterizing it as a source requiring exceptional caution.
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Jurisdictional Note
The Mirror des Justices is an English legal text with no direct American doctrinal application. Its relevance in American legal research is historical and bibliographic — relevant to questions about common law origins and the intellectual history of Anglo-American legal thought, not to any current legal rule.
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Encyclopedia Cross-Reference
See Law Mind Encyclopedia — Legal Treatises of Medieval England; Common Law Historical Sources; Andrew Horne; Selden Society Publications
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