History · Article
The Book of the Eparch
A tenth-century handbook lists the guilds of Constantinople, their margins, their monopolies and their penalties. The best surviving document of medieval urban economic regulation.
In 1891 a Swiss scholar, Jules Nicole, published a text he had found in a Geneva manuscript: a tenth-century handbook of regulations for the trade guilds of Constantinople, issued under the authority of the eparch — the city prefect, the official responsible for public order, markets and the supply of the capital.
The Book of the Eparch is the single most informative document surviving on the working economy of a medieval city anywhere in Europe, and there is nothing comparable from the Islamic world or the Latin west for another two centuries. It was probably compiled under Leo VI around 912, with later additions.
What It Covers
The text sets out regulations for something over twenty guilds. The order is significant: it runs from the most prestigious downward.
| Guild | Regulated activity |
|---|---|
| Notaries (tabullarioi) | Drafting contracts; admission by examination |
| Jewellers and goldsmiths | Purchase of precious metal and stones |
| Bankers / money-changers (trapezitai) | Currency exchange, detection of false coin |
| Silk merchants (metaxopratai) | Raw silk purchase |
| Silk dyers, weavers, clothiers | Each stage separately licensed |
| Linen merchants | Domestic and imported linen |
| Perfumers (myrepsoi) | Spices, aromatics, dyes |
| Wax-chandlers and soap-makers | |
| Grocers (saldamarioi) | General provisions |
| Butchers, pork butchers, fishmongers | |
| Bakers | Bread weight and price |
| Tavern-keepers | Hours and measures |
| Contractors and builders | Contracts and liability |
Each entry specifies who may join, what they may buy and sell, from whom, at what margin, and what the penalties are for infringement.
The Principles
Four rules run through the whole document, and they add up to a coherent economic philosophy that is not the modern one.
No one may practise two trades. The guilds are watertight. A silk weaver may not sell finished garments; a dyer may not weave; a grocer may not deal in the goods of the perfumers. The aim is to prevent any individual from controlling a chain of production and cornering a market.
Margins are fixed. Bakers are allowed a specified profit on the grain they buy; grocers a mark-up of about two miliaresia in the nomisma, roughly 8 per cent. Bankers’ commissions are capped.
Hoarding and forestalling are forbidden. Buying up supplies in advance, buying outside the city to avoid the market, and holding goods back for a price rise are all punished. Grain, fish and meat supply are policed most tightly.
Foreigners are restricted. Visiting merchants — Syrians, Bulgarians, Russians and others — are lodged in designated quarters, limited in what they may buy, and required to leave after a fixed period, generally three months. Export of certain goods is forbidden outright.
The penalties escalate from fines and flogging to expulsion from the guild — which meant loss of livelihood — and in the worst cases, for those trading in forbidden silks, mutilation and confiscation.
Silk
Five of the guilds deal with silk, which indicates its importance. The silk industry was the empire’s strategic manufacture, and the regulations divide it into separately licensed stages precisely so that no private operator could control the whole process.
Certain grades and colours — above all purple-dyed silk of the highest quality — were reserved to the imperial workshops and forbidden to private manufacture, sale or export. Selling prohibited silk to a foreigner was among the most severely punished offences in the book.
What It Tells Us
The state’s economic thinking. The purpose of regulation was not growth. It was stability: assured supply of necessities at predictable prices, no concentrations of private economic power, no speculation, and the preservation of the strategic industries. The state was managing a capital of several hundred thousand people whose discontent, as the Nika riots had shown, could destroy a government in five days.
The structure of urban work. The guilds were licensed corporations under state supervision, not independent bodies with political privileges as in the medieval west. They had no representation, no charters won from rulers, and no role in governing the city.
The money economy in operation. Prices, margins and commissions are given in coin, at a level of specificity that makes the document a primary source for Byzantine coinage and for the purchasing power of the currency.
The presence of foreign merchants. The regulations governing Syrians and Bulgarians in particular show an established, regulated international trade in the tenth century, well before the Italians arrived.
What It Does Not Tell Us
Three limitations are worth stating plainly.
It is a normative text. It says what the rules were, not how well they were enforced, and the frequency of the prohibitions suggests the practices were common.
It covers only Constantinople, and only the regulated trades. The unregulated economy — casual labour, domestic production, the rural market — is invisible.
And it is a snapshot. The document is tenth century; the Byzantine economy of the sixth and of the fourteenth centuries were different things, and the Italian commercial privileges of the 1080s onward, described in the Byzantine economy, destroyed the framework the Book of the Eparch assumes.
Afterlife
The guild system it describes survived into the Ottoman period, and the Ottoman esnaf organisations of Istanbul inherited both the structures and in some cases the trades. Continuity of urban economic institutions across 1453 is one of the better-documented threads in Constantinople to Istanbul.
For modern economic historians the book has been a fixed point in a field short of them. Almost every general account of the medieval Mediterranean economy uses it, and almost every one notes, at some point, that a single manuscript found in a Swiss library carries a disproportionate share of what we know.
The Eparch Himself
The official behind the book was the second most powerful man in the capital, and understanding his job explains the regulations.
The eparch — the city prefect, direct descendant of the Roman praefectus urbi — was responsible for everything to do with Constantinople’s internal order: the markets, the guilds, weights and measures, prices, public morals, the prisons, the water supply, building regulations, the reception of foreign merchants, and the policing of the city.
He had his own court and could impose fines, flogging, mutilation and expulsion from a guild. He commanded a body of officials and a force for enforcement. In imperial ceremonial he ranked immediately after the emperor within the city, and a tenth-century source describes him as the father of the city.
His overriding responsibility was the grain supply. A capital of several hundred thousand people, dependent on shipments from Thrace and the Black Sea after the loss of Egypt, was permanently three bad weeks from a bread riot — and the Nika revolt had shown what that meant.
Almost every provision in the Book of the Eparch makes sense as an instrument of that responsibility. Fixed margins, prohibitions on hoarding, the separation of trades, the licensing of bakers and the control of foreign merchants are not economic theory; they are riot prevention.
What the Penalties Reveal
The graduated punishments in the text are a good index of what the state actually feared.
Minor infractions — short weight, trading outside permitted hours, a guild member handling another guild’s goods — draw fines and exclusion from the guild for a period.
Serious infractions — adulterating goods, false weights, forestalling the market, moving grain out of the city in shortage — draw flogging, shaving of the head, and expulsion from the guild, which meant the end of a livelihood.
Strategic offences — selling prohibited grades of silk to foreigners, exporting forbidden goods — draw flogging, confiscation, and in the most serious cases mutilation.
The escalation is telling. Cheating a customer is punished; cheating the city’s food supply is punished harder; giving a foreign power access to a controlled technology is punished hardest of all.
The parallel with the treatment of Greek fire, described in the Byzantine navy, is exact: the empire understood certain manufactures as strategic assets and defended them by criminal law.
Guilds East and West
Setting the Byzantine guild beside its western contemporary sharpens what was distinctive about it.
| Byzantine guild | Western guild | |
|---|---|---|
| Origin | Licensed by the state | Formed by members, chartered later |
| Autonomy | Supervised by the eparch | Substantial self-government |
| Political role | None | Often represented in city government |
| Membership | Controlled by the state and the guild | Controlled by the guild |
| Prices | Set by the state | Set by the guild |
| Purpose | Supply, order, revenue | Protection of members’ interests |
The western guild was a corporation that won privileges from a ruler and frequently ended up governing the town. The Byzantine guild was an administrative subdivision of the city government with no political existence whatever.
That difference has been used to explain why Byzantine cities never developed the communal autonomy of Italian or Flemish ones, and why the commercial initiative in the eastern Mediterranean passed to the Italians in the eleventh and twelfth centuries. The Byzantine system was designed for stability and delivered it; what it did not do was produce merchants with capital, political weight and a reason to take risks.
Whether that is a sufficient explanation is argued. The commercial privileges granted to Venice, described in the Byzantine economy, are a more immediate cause, and the guild structure may be a symptom of the same fiscal conservatism rather than an independent cause.
- The Byzantine Economy — the wider system
- Byzantine Silk Production — the most regulated trade
- Byzantine Coinage — the money the prices are given in
- Daily Life in Constantinople — the city the rules governed
- Crime and Punishment in Byzantium — the penalties in context
- The Byzantine Aristocracy — the wealth outside the guild system
- Roads and Travel in Byzantium — how the goods arrived