Definition
In old English law, a penthouse or awning projecting over the front of a merchant's premises or stall, used to shelter goods or customers from the elements. The word derives from the Latin for shield, the physical resemblance being a covering that projects outward like a broad defensive surface. The term appears principally in connection with the Assize of Measures (9 Richard I), which regulated commercial practices and prohibited merchants from extending such overhanging structures across certain spaces — including, apparently, toward the sea-shore — in a manner that encroached on public thoroughfare or passage.
The legal significance of scutum was essentially regulatory: the assize treated projecting penthouse structures as potential nuisances or obstructions when improperly placed, and their prohibition in specific locations reflects the medieval concern with keeping public ways and mercantile zones free from encroachment.
Common Language
Modern common usage (Wiktionary): A small autumn constellation of the northern sky, said to resemble a shield, lying between Aquila, Sagittarius, and the tail of Serpens.
Historical common usage (Webster's 1913): An oblong shield made of boards or wickerwork covered with leather, sometimes with an iron rim, carried chiefly by heavy-armed infantry of Rome. Also noted as a penthouse or awning (marked obsolete), and as an anatomical term for a segment of the upper surface of an insect's thorax.
The gap between common and legal meaning here is complete. Modern readers encountering "scutum" will think of the constellation or the Roman military shield; neither meaning connects to the legal usage. The penthouse/awning sense that Burrill records is explicitly flagged as obsolete even in Webster's 1913, meaning it had already passed from general use by the early twentieth century. A researcher encountering scutum in a medieval English commercial or municipal document should not assume the military or astronomical sense — the legal meaning is structural and regulatory, not martial.
Why It Matters in Research
Scutum is a term of very narrow historical application. Researchers will encounter it almost exclusively in connection with early English commercial regulation, particularly assizes and municipal bylaws governing the physical layout of market spaces, quays, and mercantile frontages in the medieval period. The Assize of Measures of 9 Richard I is the primary textual anchor.
Two research traps are worth flagging. First, because the penthouse/awning meaning was already archaic by the time the major common law dictionaries were compiled, many later legal reference works simply omit it or fold it into broader discussions of purpresture (encroachment on public space) without using the term scutum at all. A researcher working backward from later sources may not find the term at all and should look to earlier Latin-language municipal records and assize texts directly. Second, the fragmentary state of Burrill's entry — which trails off mid-sentence at "SEA-SHORE" — suggests the source text from which it was drawn contained additional regulatory detail that Burrill did not fully reproduce. Researchers relying solely on Burrill for the content of the Assize of Measures prohibition should consult the assize directly rather than treating the dictionary entry as complete.
The term has no meaningful modern legal life. It belongs entirely to the historical stratum of English commercial and municipal law.
Historical Dictionary Support
Burrill's Law Dictionary is the sole historical legal dictionary source that records scutum in its legal sense, and even there the entry is incomplete, breaking off at a reference to the sea-shore prohibition without completing the regulatory rule. Burrill correctly identifies the Latin root (shield, shelter) and the Assize of 9 Richard I as the governing authority, and he accurately marks the sense as belonging to old English law.
Webster's 1913 is notable for including the penthouse/awning meaning but labeling it obsolete and attributing it directly to Burrill, suggesting that by 1913 the lexicographers found no living usage to draw upon and were essentially reprinting the legal dictionary sense as a historical footnote. This circular chain — legal dictionary to general dictionary — means neither source independently verifies the term's usage; both ultimately point back to the assize text itself.
No other major historical legal dictionary (Black's, Bouvier's, Tomlin's) appears to carry a scutum entry, which is consistent with the term's extreme narrowness of application.
Jurisdictional Note
Scutum as a legal term is specific to medieval English law and has no recognized counterpart or continuation in American law. Researchers working in Scottish, Irish, or Continental medieval sources should not assume the same regulatory context applies without independent verification.