Zanjan is a city and a province in north-western Iran, set on the old road between Tehran and Tabriz roughly 300 kilometres from the capital. Its older local name is Zangan, and under the Qajars the surrounding district was administered as Khamseh, a name older rug writing uses both for this district and, confusingly, for an unrelated tribal confederacy far to the south. The population is largely Azerbaijani-Turkic speaking, with Kurdish villages toward the south-western edge and Tati-speaking pockets elsewhere in the province, and the region is bounded by weaving country on two sides: Kurdish BijarSee in the carpet dictionary, in Kurdistan province, to the south-west, and Hamadan further south. That position explains more about a Zanjan rugSee in the carpet dictionary than anything else about the place.

Weaving here belongs to village and pastoral households rather than to town workshops. Families move with their flocks through the spring and summer grazing, then come down from the mountains to the lower plains when the weather turns, set up their looms and weave through the cold months. The rug is winter work, made in the season when there is nothing to do outdoors, and it shows in the result: these are hand-judged pieces with the slight irregularities of village weaving rather than the ruled precision of a city loomSee in the carpet dictionary working from a drawn cartoon.

Mobility dictates the loom, and the loom dictates the size. These are small, compact frames that can be taken apart and carried, so the rugs that come off them are correspondingly modest: around 120 by 180 centimetres, about four feet by six, or smaller. Anyone hunting for a large Zanjan will have a long search, because the room-sized format is rare in this tradition. For a hallway, a bedside, a study, or the space in front of a sofa, the proportions are close to ideal.

Two design families cover almost everything the region produces. The first is straightforwardly geometric: angular medallions, hooked and stepped outlines, motifs carried in the memory rather than copied from paper. The second is the Herati, known in Persian as mahi, meaning fish, a repeated lattice of diamonds each holding a small rosetteSee in the carpet dictionary, with curving leaves set around it that were thought to resemble fish swimming about the flower. The pattern takes its name from the city of HeratSee in the carpet dictionary and is woven all over Iran, from Tabriz and SaroukSee in the carpet dictionary to Bijar and Hamadan; in Zanjan it arrives by way of those last two neighbours.

Older pieces lean strongly geometric, and they carry a layout worth learning to recognize. A central medallionSee in the carpet dictionary is framed by a second, hexagonal medallion running around it, so the middle of the rug reads as a shape held inside another shape. Variations add four smaller motifs in the corners, or set smaller geometric medallions above and below the main one. The same family of layouts appears in HerizSee in the carpet dictionary and KarajaSee in the carpet dictionary to the north-west and in Abadeh and QashqaiSee in the carpet dictionary weaving far to the south, which is useful context: it is a shared village and tribal idiom rather than a Zanjan invention.

Color runs warm and deep. Fields are usually beige, a dark red, or one of several blues, with orange, grey, brown, further blues and a deeper red used for highlights and the smaller motifs. Deep red and deep brown are the notes the region is best known for, and they do most of the work of giving these rugs their weight on a floor. Bright, high-key palettes are not what Zanjan does; the effect is closer to banked embers than to a flower garden.

The foundation is almost always cotton and the pileSee in the carpet dictionary is woolSee in the carpet dictionary, and the wool is not bought in: it comes from the weavers' own flocks, the same sheep they herd from pasture to pasture through the year. That is a small fact with visible consequences. The fleece is whatever the season and the grazing gave, so dye takes a little differently from clip to clip, and a field of one color can show faint horizontal banding, the effect known as abrashSee in the carpet dictionary, where a new batch of yarn came onto the loom. It is a sign of a genuine village rug, not a fault.

Which of the two neighbours shaped a given weaver's hand is the most useful question to ask of a Zanjan rug, because much of what separates one from another follows from it. Pieces from the Bijar side of the tradition follow Bijar's designs closely, mostly Herati or Herati mixed with floral elements, but work with the local dyes, so the drawing looks familiar while the color does not. Pieces from the Hamadan side share Hamadan's designs and its reds, deep blues and creams so closely that the two can be difficult to tell apart.

Weight is where the Bijar connection pays off. Bijar rugs, woven by Kurdish weavers a little to the south-west, are the densest and heaviest of all the Persian types, beaten down so hard on the loom that they earned the nickname iron rugs, and a Bijar-influenced Zanjan comes close. Not quite as thick, but close enough to be genuinely heavy-duty, and close enough that Zanjan is the sensible substitute for a buyer who wants Bijar geometry and Bijar solidity. Rugs from the Hamadan side of the region run slightly thinner in the pile than a Hamadan proper, though still substantial.

Either way a Zanjan belongs in the thick-pile group, alongside Heriz, Mashad, Sarouk, Bijar and GabbehSee in the carpet dictionary, and that has practical consequences at home. A deep pile takes footfall well and hides the marks of daily life, but it also holds an impression under anything heavy, so put a mat beneath a rolling desk chair rather than letting the castors work directly on the wool. Turn the rug end for end at least once a year as well, so the loaded area gets a rest and the wear spreads evenly across the whole piece.

What a Zanjan is not is a finely drawn rug: this is not a tradition built on fineness, and a knot countSee in the carpet dictionary tells you very little about one. The character sits in the weight, the geometry and the color. Judge one the way its weavers would have judged it, by how the wool feels in the hand, whether the colors sit well together, and whether the medallion is drawn with conviction. Taken on those terms, a small Zanjan is one of the more hard-wearing hand-knottedSee in the carpet dictionary rugs you can put on a floor, and it is built to outlast several changes of furniture around it.

A Persian rug is an Iranian rug — a rug hand-knottedSee in the carpet dictionary in Iran — and the tradition behind it is the oldest documented anywhere. The earliest surviving carpet, the Pazyryk rugSee in the carpet dictionary, was found preserved in a frozen burial mound and dates to the fifth century BC — roughly 2,500 years ago — and it is already accomplished work, not a beginner's craft. What began as warm, hard-wearing floor coverings for tribal households grew, over those centuries, into the art form that every other rug-weaving country has borrowed from.

Two later chapters shaped what a Persian carpet looks like today. Under the Safavid dynastySee in the carpet dictionary, from 1501 to 1732, the court promoted weaving alongside painting and calligraphy, and the workshops of Tabriz, HeratSee in the carpet dictionary, Kashan and Kerman produced the masterpieces that now sit in museums. This is when the great central medallionSee in the carpet dictionary appeared, and when designs grew elaborate enough that a separate designer — often a miniature painter — drew the pattern onto a cartoon for the weaver to follow. The second chapter came in the nineteenth century, under the Qajar dynastySee in the carpet dictionary, when production reached its historical peak, exports to Europe and America boomed, and the workshop industry whose descendants still weave today took its modern shape.

The trade sorts Persian rugs into three families. City rugs — Tabriz, Kashan, Kerman, Nain, Isfahan — are woven in workshops from a drawn design, carry the highest knot densities and come in the widest range of colors, sizes and patterns. Village rugs such as HerizSee in the carpet dictionary, BakhtiariSee in the carpet dictionary and KarajaSee in the carpet dictionary sit in between, mostly geometric and largely woven from memory. Tribal rugs — Baluch, TurkomanSee in the carpet dictionary, QashqaiSee in the carpet dictionary, each named after the people who weave it — are made on small portable looms, so they run smaller, and their bold geometric drawing comes from the weaver's own head rather than from paper.

The design vocabulary draws on a deep stock of motifs: Shah AbbasiSee in the carpet dictionary palmettes, flowing arabesques, the small repeating Herati patternSee in the carpet dictionary, medallions, garden and tree-of-life compositions. These combine with regional habits into styles a practised eye can place at a glance, from the bold geometric medallions of Heriz to the fine curvilinear florals of Isfahan.

The classic palette is built on natural dyes: madderSee in the carpet dictionary reds, indigo blues, saffron yellows and the soft whites of undyed woolSee in the carpet dictionary, settled into combinations refined over centuries. Natural dyes age gracefully, mellowing into the patina that older rugs are prized for, and slight shifts of tone between dye batchesSee in the carpet dictionary — the effect called abrashSee in the carpet dictionary — are a mark of small-batch natural dyeing, not a flaw.

The pileSee in the carpet dictionary is almost always woolSee in the carpet dictionary, and in a Persian wool rug the wool itself decides much of the quality. The best fleece comes from high-altitude flocks, where it grows thicker and richer in natural oils; spring-sheared wool beats the autumn clip, and hand-spun yarnSee in the carpet dictionary gives a finer, softer thread than machine spinning. Fine pieces add silk highlights to a wool pile, and at the very top sits the Persian silk rug, woven in pure silk. Foundations are usually cotton in city weaving, wool in tribal and older pieces, silk at the very top of the range.

Every knot is tied by hand, one at a time, in one of two forms: the asymmetric Persian knotSee in the carpet dictionary, usual in central and eastern Iran, or the symmetric Turkish knotSee in the carpet dictionary, common in the north-west ever since Seljuk weavers introduced it in the eleventh and twelfth centuries. A large rug holds in the region of two million knots and can occupy a weaver for about a year.

Knot densitySee in the carpet dictionary is the figure newcomers fixate on, and the finest silk-foundation pieces do reach as much as 1,000 knots per square inch. But densitySee in the carpet dictionary only matters as far as the drawing demands it: a curvilinear Isfahan needs a fine weave to stay sharp, while a geometric Heriz is famously durable at a modest count. Material, symmetry, color harmony and condition say more about quality than any single number.

Persian carpets settle into modern rooms as naturally as classical ones, as a focal point in a living room, a foundation under a dining table or a quieter accent in a bedroom. Care is undemanding: gentle vacuuming without a rotating brush, an occasional turn for even wear, and a professional wash about every five years — sooner in a hallway or entrance, less often in a quiet room.

A hand-knotted Persian rug tends to outlast its owners. Pieces a century old regularly survive in fine condition, their colors settled and their pile supple, often looking better than when they left the loomSee in the carpet dictionary. A well-chosen, well-kept rug holds its worth and passes down as a family heirloom rather than being replaced — which is precisely what the knots, the wool and the dyes were always for.