Definition
A standard, banner, or ensign carried in war. In its legal and heraldic sense, a pennon is a military flag borne on the field, associated historically with knights and lesser military commanders who ranked below those entitled to bear a banner (a larger, square flag). The pennon was a mark of military identity and, in feudal contexts, a symbol of command authority over a retinue.
Common Language
Modern common usage (Wiktionary): A thin, often triangular flag or streamer, especially as hung from the end of a lance or spear; a long pointed streamer on a vessel; or, in an older sense, a wing or feather of a bird.
Historical common usage (Webster's 1913): "A wing; a pinion." — citing Milton's poetic usage.
The gap between common and legal meaning is modest but worth noting. In ordinary and literary usage, pennon carries a decorative or nautical sense — a tapering streamer with no inherent command significance. In legal and feudal military contexts, the pennon is a structured emblem of rank and authority, distinguishing its bearer's grade of command from that of a banneret or knight. The poetic sense (a wing or pinion) has no legal valence whatsoever.
Common Confusion
Pennon and banner are sometimes used interchangeably in historical sources, but they denoted different ranks in the feudal military hierarchy. A banneret was a higher-ranking knight entitled to bear a square banner and to lead his own company under that flag. A pennon was the ensign of the ordinary knight, typically pointed or swallow-tailed in shape. Promotion from pennon to banner — sometimes performed on the battlefield by cutting the tails from a pennon to make it square — was a recognized act of military elevation. Researchers working with feudal tenure records or records of military obligation should not treat the two terms as synonymous.
Why It Matters in Research
Pennon is a term researchers are unlikely to encounter in modern legal instruments but will find in medieval and early modern sources touching on feudal tenure, military service obligations, heraldry, and the law of arms. Several contexts where precision matters:
Feudal military service records may describe a tenant's obligation to serve "with pennon" or "with banner," language that encodes the scale and grade of military duty owed. These distinctions affect how service obligations are interpreted in historical land tenure research.
Heraldic law and the law of arms, which had quasi-judicial enforcement through the Court of Chivalry in England, treated the right to bear particular ensigns as a legal entitlement. Disputes over who was entitled to display a pennon, banner, or coat of arms were litigable. Researchers working with Court of Chivalry records or heraldic visitation documents will encounter pennon as a term of art with legal consequence.
The term appears in chronicles, treatises on chivalry, and early military law sources where it functions as a rank indicator. Misreading pennon as a generic word for "flag" will cause a researcher to miss the status and command implications embedded in the language.
Historical Dictionary Support
Both editions of Black's Law Dictionary carry identical, compressed entries: "A standard, banner, or ensign carried in war." This definition is accurate as far as it goes but strips away the rank-specific meaning that gives the term its legal significance. Neither edition distinguishes pennon from banner, explains the feudal hierarchy the term reflects, or connects it to the law of arms or military tenure. For research purposes, Black's entries function as a pointer — confirming the term is legal vocabulary — rather than as a complete tool. Researchers needing working depth should consult treatises on feudal tenure and heraldic law rather than relying on dictionary entries alone.
Jurisdictional Note
Pennon as a legal term of art is primarily an English legal and heraldic concept rooted in the feudal military system. It has no operative modern jurisdiction. Researchers will encounter it in English historical sources; it does not appear as a living legal term in any contemporary common law system.