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Inheraldry, thefield (background) of ashield can bedivided into more than one area, or subdivision, of differenttinctures, usually following the lines of one of theordinaries and carrying its name (e.g. a shield divided in the shape of achevron is said to be parted "per chevron"). Shields may be divided this way fordifferencing (to avoid conflict with otherwise similar coats of arms) or for purposes ofmarshalling (combining two or more coats of arms into one), or simply for style. The lines that divide a shield may not always be straight, and there is a system of terminology for describing patterned lines, which is also shared with the heraldic ordinaries.
French heraldry takes a different approach in many cases from the one described in this article.
Common partitions of the field are:
(In the above "left" and "right" are from the viewer's perspective, whereas the heraldic terms "sinister" and "dexter" are from the perspective of the person carrying the shield.) Nowadays, however, the 'party' is often omitted, even in 'official'blazons, e.g. inletters patent and extracts of matriculation.
A field cannot be dividedperbordure (as, if this did exist, it would be indistinguishable from the bordure), but a bordure can be divided or counter-changed.
Neither can a field (nor anycharge) be dividedperchief, for similar reasons; though both Canadian and Scottish Public Registers have official records of fields or bordures divided 'per chief'. The earliest such record in theScottish Public Register is before 1677, "parted per chief azure and gules three skenes argent hefted and pomelled Or Surmounted of as many Woolf-heads couped of the third."[1] and a bordure per chief is shown in the arms ofRoy, Canada. A chief is considered a charge in English heraldry and is considered layered atop the field.
Shields may also be divided into three parts: this is calledtierced, as intierced per pale, azure, argent and gules (though perhaps inEnglish heraldry this is rarely if ever done,[citation needed] and the foregoing shield would be blazoned — as the pale is supposed to be one-third of the width of the field and is always so depicted under these circumstances —per pale azure and gules, a pale argent.[citation needed] butScottish heraldry does use 'tierced in pale' (e.g. Clackmannan county (nowClackmannanshire) hasOr; a saltire gules; a chief tierced in pale vert, argent, vert ...)[2] A particular type of tiercing, resembling aY in shape (division lines per bend and bend sinister coming down from the chief, meeting at the fess point, and continuing down per pale), is calledper pall (alsoper pairle). The arms of Pope Benedict XVI is "tierced in mantle" – as described in Vatican information pages, but the usual term in, for example South African heraldry, ischapé ployé (with arched lines, with straight lines:chapé (mantled)), which may be blazoned with three tinctures or just two – e.g. Okakarara Technical Institute:Gules, chapé Azure, on the partition lines respectively a bend and a bend sinister enhanced, in base a demi-cogwheel, Or, with a fountain issuant. Shields may also be divided into three parts by a combination of two methods of division, such asparty per fess, in chief per pale. Another example is in the arms ofClive Cheesman:per pale and per pall.[3] This is to be distinguished from the essentially unique partition in the arms of the2nd Weather Group of theUnited States Air Force, which isDexter per chevron ployé and sinister per fess enhanced.[4]
A shield may also beparty per chevron reversed (inverted), which is like party per chevron except upside down. A section formed by two (straight) lines drawn from the corners of the chief to the point in base is calledchaussé (shod), which must be distinguished from thepile, the point of which does not reach the bottom of the shield. With arched or bent (French:ployé) lines it is calledchaussé ployé.[5][6]
One common reason for dividing the field in heraldry is for purposes of combining two or more coats of arms to express alliance, inheritance, occupation of an office, etc. This practice, calledmarshalling, initially took the form ofdimidiation, or splicing together two coats of arms split down the middle (or sometimes, though rarely, split across the centreper fess or quarterly) so that half one coat was matched up with the opposite half of the other. As this would sometimes yield confusing or misleading results, the practice was supplanted byimpalement, which kept both coats intact and simply squished them into half the space. According to Fox-Davies (1909), the practice ofdimidiation was short-lived and had already reached its peak in the early 14th century, while impalement remains in practice to modern times. One important remainder of the practice, however, is that when a coat of arms with a bordure is impaled with another coat, the bordure does not continue down the centre, but stops short where it meets the line of impalement.[7] Eventuallyquartering gained usage, and in the height of its popularity during theVictorian era, some coats of arms featured hundreds of "quarterings" (see the Grenville arms at right). More usually, however, a quartered coat of arms consisted of four parts, as the name suggests. The origin and underlying purpose of quartering is to express inheritance by female succession: when a female heir (who has no brothers, or whose brothers have all preceded her in death) dies, her son (onlyafter her death) quarters her arms with those of his father, placing the father's arms in the first (upper left) and fourth (lower right) quarters and his mother's arms in the second (upper right) and third (lower left).[8]
In the UK heraldries, complex systems of marshalling have developed, and continue to thrive, around heraldic expressions of inheritance. In many cases of marriage, the shield isimpaled with the husband's entire coat of arms placed on the dexter side and the wife's entire coat placed on the sinister side; if the wife is anheiress, however, her arms are placed inescutcheon over her husband's (such usage is almost entirely English, Scots marshalling being impaling like any other marriage arms).[9] If the husband is a knight of any order, however, the ensigns of that order belong only to him and are not shared with his wife. Two separate shields are then employed, the dexter shield bearing the husband's arms within the circle of his knighthood, and the sinister shield bearing the husband's arms impaled with the wife's usually encircled with a meaningless wreath of oak leaves for artistic balance.[9] A malepeer impales the arms of his wife as described above, but including thesupporters, coronet and helmet of the peer; if he is also a knight of any order, the two-shield method is used.[10] If a female peer marries a commoner, however, the husband places her arms inescutcheon, surmounted by a coronet of her rank, over his own, but the supporters of her rank cannot be conferred to him; the wife bears her arms singly on a lozenge with the supporters and coronet of her rank.[10] Volumes may be written on all the endless heraldic possibilities of this convoluted system of marshalling, but it may suffice here to say that for various purposes, arms may be marshalled by four basic methods:dimidiation by clipping and splicing two coats (usually per pale),impalement by dividing per pale and crowding an entire coat of arms into each half,quartering by dividing the shield into usually four (but potentially innumerable) "quarters", andsuperimposition by placing one coat of arms inescutcheon over another. It is also worth noting that one common form in German-Nordic heraldry is "quarterly with a heart" (a shield quartered with an inescutcheon overall). This may have stemmed from the continental practice of sovereigns placing their own hereditary arms inescutcheon over the arms of their dominions.[11]
The arms ofZviahel,Ukraine, show an unusual form of marshalling quarterly with a heart, where one quarter is dimidiated while the others are not.[12]
Divisions of the field, like the ordinaries, may follow complex line shapes. Most of these "sections" have developed conventional names in English, but modern artists, particularly in Finland, have developed new sections influenced by shapes found in the local flora.[13] Among the most common of these are engrailed, invected, indented, dancetty, wavy (also called undy), nebuly, embattled, raguly, dovetailed and potenty (pictured below).[14] Notable modern forms include the "fir twig section" (Finnish:havukoro) and "fir tree top section" (Finnish:kuusikoro).[15] These can be found in the arms of a number of municipalities in Finland, and the latter can also be found in the arms of Mullsjö Municipality in Sweden.[16]
 |  |  |  |
| Engrailed | Invected | Indented | Dancetty |
 |  |  |  |
| Wavy (or Undy) | Nebuly | Embattled | Raguly |
 |  | ||
| Dovetailed | Potenty |
Besides the complex lines discussed above, divisions of the field may also be modified in other ways. Sometimes the division of the field may befimbriated (lined) or, perhaps less properly, "edged"[17] of another tincture, ordivided by some ordinary or its diminutive. The latter differs from a parted field that then bears the ordinary, in that if the ordinary thus dividing the field is between charges, the charges are not overlapped by the ordinary but the ordinary is between them. A famous example of this is thegreater arms of Sweden, which is "quartered by a cross Or..."[18]
One division of the field (though it is sometimes described as a charge) is restricted to the chief: when the chief is divided by a bow-shaped line, this is called achapournet orchaperonnet ("little hood").[19]Rompu, meaning "broken", is often applied to a chevron, where the center is usually broken andenhanced (brought to a sharper point than normal).[20]
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