MERCATUS VIRIDIS
The Green Market · Trading Post · Provincia Montium Ferri
Mercatus Viridis is the empire's northernmost commercial waystation and, depending on which set of records one consults, either a modest frontier post managing a limited volume of specialised goods or the single most commercially significant installation per square metre in the empire. I have consulted both sets of records. The official records are accurate as far as they go. The Mons Ferreus merchant guild's private estimates go further. I will not reproduce either here, but I will note that the discrepancy between them is not a small one, and that both sets of figures were produced by people with detailed professional knowledge of the goods that cross the exchange line. The disagreement is not about the facts. It is about which facts are permitted to appear in which documents.
Mercatus Viridis — the Green Market, named for the valley's alpine meadow character rather than any particular abundance of commerce, though the commerce is considerable — is the single point at which the Roman economy and the dwarven Holds meet in formal, regulated exchange. It sits in the upper valley of the pass road north of Mons Ferreus, at the elevation where the maintained road gives way to the more demanding mountain approaches, and it is built around a concept as much as a location: the exchange line, the precise boundary at which Roman administrative authority ends and Kharak-Duun's begins, and across which everything that moves between the two civilisations must pass in daylight, declared, and documented.
The post has operated under its current formal structure for three centuries, and the structure has not required significant revision because both parties have found the original terms more useful to observe than to renegotiate. What has changed is the volume and character of what crosses the line, adjusted by mutual agreement in every five-year catalogue review in ways that the original agreement's drafters would recognise in principle and find surprising in practice. The current catalogue represents nine centuries of accumulated adjustment. It is the most negotiated commercial document in the empire. It is also, in several of its newer provisions, the document that the Governor's office finds most difficult to explain.
Demographics
Approximately four hundred permanent Roman residents staff the post: the prefect and administrative clerks, the Legion century that provides security and pass monitoring, the exchange documentation specialists whose work requires fluency in Dwarvish and a detailed knowledge of the catalogue terms, and the small service community that sustains them. The dwarf complement on the exchange side is not formally counted by Roman administration; the estimates of those who have observed the exchange side from the line range from two hundred to four hundred, with the higher figures associated with the past eight months.
The seasonal trader population is harder to characterise. The post draws Roman merchants from as far as Lacusum and the capital, arriving to inspect and bid on incoming dwarf goods before they reach the Mons Ferreus market. The exchange documentation specialists are among the most sought-after professionals in the province; their ability to read the catalogue's Dwarvish provisions and identify opportunities in the exchange terms makes them commercially valuable in ways that the Legion century's pay scale does not reflect. Several have left post service for private commercial employment and have been replaced by people with less experience, a pattern the current prefect has flagged to the Governor's office without receiving a resolution.
Government
The Post Prefect administers the Roman side of the exchange under Governor Montana's authority. The current prefect, Lucius Calva Rupestris, is in his third year and was promoted from the documentation division: a deliberate choice by Montana, who concluded after her predecessor's tenure that the post's primary governance challenge is not security or logistics but catalogue interpretation, and that a prefect who understands what is being exchanged is more useful than one who understands how to move it. Rupestris has validated this assessment. He has also, in the past eight months, begun filing reports about the exchange side's activity that Montana considers the most practically important documents currently reaching her desk and that she has not forwarded to the Senate.
DM ONLYDefences
One Legion century — eighty soldiers — under the Post Prefect's command, with the specific operational profile of a post that has never faced military threat and is therefore organised around the security requirements of the exchange itself: monitoring the line, managing access to the exchange hall, and maintaining the pass road to the standard that keeps the post accessible in all but the worst winter conditions. The century's emergency protocols include pass closure procedures and a signal chain to Mons Ferreus that can reach the Governor's office in twenty minutes. The dwarf security complement on the exchange side is not known in number or composition; the Roman garrison commander's professional assessment, noted in his last annual report, is that it is larger than it was.
Industry & Trade
The exchange catalogue governs what moves across the line and at what terms. The Roman-to-dwarf flow includes iron ore, copper, specific agricultural products, and a range of manufactured items that the Holds' specifications have refined over nine centuries of catalogue adjustment. The dwarf-to-Roman flow includes metalwork of a quality that Roman smithing cannot replicate, precision instruments, architectural elements, and refined materials whose processing the Holds have never permitted Roman observers to document. The exchange rates are set by the catalogue terms, negotiated at five-year reviews, and applied by the documentation specialists whose interpretive judgements constitute the post's most consequential daily decisions.
The volume of exchange goods that passes through the post is officially described as modest in the provincial administration's public accounts. The Mons Ferreus merchant guild's private estimates, which Gaius Ferrum Montanus's factor office declines to contradict, suggest that the official figures represent the declared and documented component of a larger flow whose undeclared elements move through channels that both parties to the exchange are aware of and neither formally acknowledges. The five-year catalogue review conducted six months ago included three new provisions in the Roman-to-dwarf goods categories that the documentation specialists have not been able to map to any stated manufacturing requirement in the Holds' history.
DM ONLYInfrastructure
The post road from Mons Ferreus is the Via Montium's northern continuation, maintained to the same standard as the provincial road below until it reaches the post itself, where the maintenance responsibility transitions to the post garrison. Above the exchange line, the road is Kharak-Duun's responsibility; what it looks like on the other side has been visible from the Roman observation point for nine centuries and has, in the past eight months, changed in ways the garrison's engineers have been documenting with careful attention.
The Exchange Hall is the post's primary functional building: a structure of substantial construction built jointly by Roman and dwarf engineers in the third century, its foundation work incorporating techniques that Roman engineering has been studying since and not fully replicated. It spans the exchange line precisely, its interior divided at the midpoint by a floor marking whose accuracy both parties verified at installation and reverify at each five-year review. The Signal Tower relay connects the post to Mons Ferreus; the post also maintains its own observation platform with sightlines across the exchange line that the garrison uses for the continuous monitoring that the past eight months have made considerably more interesting than the previous eight centuries.
Guilds and Factions
The exchange documentation specialists are the post's most significant informal faction: a professional community whose expertise makes them irreplaceable and whose working relationships with their dwarf counterparts on the exchange side have, over careers spanning decades, produced the specific mutual understanding that sustained close professional contact generates. They are the people who know the Holds best of any Roman civilians in the empire, and they are also the people who have been watching the exchange side's activity change over the past eight months with the most informed alarm. Their assessments are shared with the prefect. Several have begun making arrangements that the prefect has noted and not commented on.
DM ONLYHistory
Mercatus Viridis was established in the third century concurrent with the dwarf engineering partnership, as the formal exchange point for the goods and expertise that partnership required to move. The Exchange Hall was built in the third century and has been in continuous operation since. The current exchange line structure was formalised in the ninth century, replacing an earlier arrangement that both parties had found adequate and that the nine-century-old agreement has proven more durable than anyone in the third century anticipated. Gaius Ferrum Montanus's most recent catalogue review was conducted six months ago. The railway survey on the exchange side began eight months ago. For full chronological detail, see: Annales Mundi.
Points of interest
The Exchange Hall (spanning the exchange line, joint Roman-dwarf construction, third century) — the most significant piece of inter-civilisational architecture in the empire, its interior divided at the precise exchange line midpoint by a floor marking that both parties consider the most important line in the province. Visitors admitted to the Roman half of the hall can see the dwarf side's interior and, through the hall's northern windows, the exchange side's current activity. What is visible through those windows has changed considerably in the past eight months.
The Roman observation platform (garrison post, continuous staffing since the third century) — the position from which the Roman garrison monitors exchange side activity. The current observation logs, maintained in the Post Prefect's office and accessible to authorised officials, constitute the most detailed record of dwarf surface activity available to Roman administration. The logs for the past eight months are stored separately from the historical archive, in a locked cabinet whose key the prefect keeps personally.
The exchange line itself (marked at intervals by joint-placed boundary stones, ninth century, reverified at each five-year review) — technically a feature rather than a structure, but the most consequential line in the province. Crossing it without authorisation on either side is a violation of the trading post agreement's most fundamental provision. In nine centuries of operation, no Roman has crossed it without authorisation. The agreement does not specify what would happen if one did. The documentation specialists consider this omission deliberate and instructive.
Tourism
Mercatus Viridis does not receive tourist visitors in any meaningful sense. The post is a working installation with restricted access; the Exchange Hall's Roman half is accessible to authorised merchants during exchange sessions and to official visitors with Governor's office clearance. The observation platform is not open to the public. The valley's alpine character is striking, and the pass road above the post offers mountain scenery of the kind that artists from the interior provinces have been travelling to paint for three centuries. The mountain Romans consider the scenery unremarkable and the artists' interest in it a reliable indicator that the artists have not spent a winter at altitude.
Architecture
The Exchange Hall is the architectural centrepiece: a building of substantial and deliberate permanence, its stonework in the foothills granite but cut to tolerances that reflect dwarf consultation on the construction. Its proportions are neither purely Roman nor purely dwarven but a negotiated hybrid that both parties approved and that architects from both traditions have studied without fully accounting for the other side's contributions. The Roman post buildings are standard Legion construction, functional and adequately maintained. The dwarf side's visible architecture, observed from the Roman position across the line, has always been more substantial than the exchange volume would seem to require. What has appeared on the exchange side in the past eight months is not architecture in any category the garrison engineers have a name for.
Geography
The post sits in the upper valley at the point where the maintained road gives way to mountain approach — the last flat ground of significant extent before the pass proper, and the natural location for an exchange point that both parties need to access reliably. The valley's alpine meadow character gives the post its name: the green of the high meadow in summer is the first significant colour visible after the grey and granite of the approach road. The exchange side's terrain mirrors the Roman side's, the valley continuing north into Kharak-Duun territory at the same gradient. What has been added to the exchange side's terrain in the past eight months is visible as a geometric modification of the valley floor that the garrison engineers have measured, from the observation platform, as extending approximately four hundred metres north of the exchange line.
Climate
The upper valley is substantially colder than Mons Ferreus below, the altitude adding conditions that the pass road's maintenance schedule must account for. The post closes the exchange for three months in winter when the pass becomes impassable; this closure is the one period in the annual cycle when the exchange line's boundary stones are not under continuous observation from both sides, and the one period that the current prefect has begun to think about differently than his predecessors did. The summer window, when the exchange operates and the valley is accessible, is approximately six months. The past summer window has been the most closely observed in the post's nine centuries of operation.
Roman counter-goods: iron ore, copper, specific agricultural products, manufactured items per exchange catalogue.
Volume officially described as modest.
Privately estimated otherwise.
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