Ask Another Laurel - What is a Mark?
by Caleb Reynolds
The following was written for the
AEthelmearc GazetteI'm still working on part two of the how not to be noticed series, but I keep getting distracted: orange omelets; certifications for work; medieval riding horses; cleaning the house; car repairs; Roman dodecahedrons. Part 2 is being written but I needed a mental pallet cleanser. I will keep this short.
So, I was doing some research and kept coming across a Mark as a unit of currency. I kept finding references such as "A 1265 French ordinance ruled that a squire could not spend more than twenty Marks on a rouncey", or "The Bohemian King Wenzel II rode a horse valued at one thousand Marks in 1298", or "[London] servants and artisans were not allowed to buy cloth costing more than 2 marks a length". But, what is a Mark? Why did France, England and Bohemia use the same currency?
The short answer is that they didn't. Kingdoms used a Mark to do monetary transactions. A medieval Mark, unlike the pre-Euro German Mark, wasn't a coin, but an international unit of accounting that was the equivalent of 160 Pennies (ish). This allowed people to easily convert money from one currency to another, since most European kingdoms used a similar form of currency derived from ancient Rome: Denarius (Penny, Pence, Pfennig, Denier), Sesterius or Solidos (Shilling, Sous, Groschen, Quentchen), and Libra (Pound, Pfund, Livre, Gilder, Taler). All rabbit holes lead to Rome. See, one Imperial Roman pound of silver was minted into 240 silver coins called denarius or denarii.
Each currency followed similar rules, although the actual numbers changed over time: 12 pennies to the next biggest coin, 20 of those to the next step up. On paper, 240 pennies would weigh one pound-weight of silver and the Pound, Livre, etc, would be the equivalent value of a pound-weight of silver: an ancient Roman pound-weight, which is less than a modern pound-weight (329g vs 454g). A Mark (from the Latin "Marca") was 160 silver pennies (ish) from anyplace, or 2/3 of a pound-weight of silver, ancient Roman pound-weight, of course. Or 8 troy ounces; about 250g. This dates back to the time of Charlemagne's father, Pepin the Short. I have been unable to find out why this arbitrary weight was used. I couldn't find anything obvious, like the annual salary of a Roman soldier or the cost of a plow horse. There probably was a logical reason for the 2/3rd of a pound-weight, but I have been unable to discover it.
I can't imagine that Pepin was brain storming about what weight they should use to make international commerce easier and instead of using a full pound-weight, he picked up a 12" Philly cheesesteak and said, "Yes, this cheesesteak is the right weight for these new Marks." And, of course, since he was the king, they had to go with the cheesesteak's weight, much to the disappointment of team-double-order-of-Buffalo-wings. The only "logical" explanation I could find, while searching academic sources, was that a Libra (Pound, Pfund, Livre, Gilder, Taler) was 12 troy ounces of silver and a Mark was 8 troy ounces of silver. You will notice that while this is technically correct, it doesn't answer our question as to why.
Seriously, I can't think of any logical reason why. Everyone already agreed to use the 12 troy ounces as the weight of 240 silver pennies (more or less), so the Pound, Pfund, Livre, Gilder, and Taler would represent the same mass of silver. I don't know why everyone didn't just use that as the inter-kingdom standard. Why 2/3rd of a pound? How is 13s 4d an easier number to deal with than 20s. Both 160 and 240 are divisible by 10, 8, and 4, but 240 is also divisible by 12. I've been racking my brain as to what logical reason why a Mark was such an arbitrary weight. It's about the weight of two adult hamsters, or ten 'AA' batteries, or an empty heart of a child. Or a medium sized russet potato. Or a small, paper-back book. Or, as Google AI tells me, a handful of coins (I hate AI because of answers like that). Maybe Pepin just hated exchequers.
Robert Tye's "Coin Weight and Historical Metrology (Third Revision, 2022)" gives the following explanation: "The simplest and most readily available measure of volume available to mankind, at least for a stuff like grain, is using a kind of cup made up of the two hands, when used to scoop up a small heap. My own trials of this with modern wheat grain suggest this amount of grain weighs about 250g. In addition, many authors have estimate the average human daily bread ration at about 500g, thus approximately double that amount. These two physical measure arise out of the basic facts of human beings themselves, and might well be connected to the prominence of 500g and 250g standards in Europe, Persia, and China, as will be accounted below." [p116]
This is an interesting idea, but the 2/3rd of a Roman pound-weight was never, as far as I can tell, used to measure out grain or bread; only silver. Most set pricing for bread mentions a full pound of bread to be sold a certain amount. Criminal charges were handed out to bakers who sold bread under a full pound; the whole concept of the baker's dozen was a way of making sure that a dozen small rolls weighed a combined 1 pound, with an extra roll thrown in to make up for any undersized rolls. Philip Grierson, in "Money and Coinage under Charlemagne" theorized that there were two different Carolingian pounds, a heavy one of 16 troy ounces and a light one made up of 15 troy ounces, which might have had something to do with the difference between a Roman pound and an Arabic pound. Or it might have had something related to internal and external commerce. Tye went on in his paper to write, "...but with a general lack of consistency in the coins and apparently no weights or texts to corroborate anything, we are left somewhat whistling in the dark." [p143] We might never know the real reason.
Unfortunately, despite the general agreement about the theoretical weight of the penny, the number Pennies to a Mark varied, based on the time and place, being 144 in some parts of Germany and 160 in others, 160 in Britain, Scotland, Ireland, Flanders and France, and between 160 and 384 in Scandinavia, probably due to the physical size of coins minted in various places. Several sources I found list the weight of a Mark in Gotland as 200g, whereas in Pomerania the Mark was just under 250g. Spain had a complicated history of coinage in the Middle Ages due to the various Islamic and Christian kingdoms that were rivals and what was done after the unification of Spain under Ferdinand and Isabella. And don't get me started on what the Italians were doing. But, for the purposes of this short article, let us just agree that a Mark was 160 silver pennies and move on.

The purpose of the Mark was to make commerce easier, particularly between kingdoms. If you owed someone 1 Mark, you could either count out 160 pence, or the local equivalent, or you could hand over 2/3rd of a Roman pound-weight of silver, about 250g, as mentioned above. As long as the weight of silver was sufficient, that was what was used to pay your debt. Coins, ingots, serving plates, cutlery, rings; the weight of silver was all that mattered. If you owed 100 Marks, you would need to turn over 25kg of silver as collecting and transporting 16,000 pennies would be more of a challenge. Richard the Lionheart's ransom was set at 150,000 Marks, which was 32,900kg of silver. No fiddling about with converting English Pounds to Austrian Talers, the English just had to fork over almost 33 metric tonnes of silver. The huge amount of silver was split between The Holy Roman Emperor, Heinrich VI and the Duke of Austria, Leopold V. The Austrians used the silver to improve the walls of several cities and to establish the Austrian mint. What the Emperor used his share for is a subject for another article.
Marks weren't used for small debts; if you owed someone 50 Pennies, you paid in coins. Either 50 silver pennies, or, 4 Shilling coins and 2 Pence. Pound coins, and their equivalent, were used for medium sized payments within one kingdom. Because of the difference in weight between various coinage, an exchequer or a money changer could figure out the the relative value between coinage which could be various sizes and weights, particularly in port cities where sailors and merchants could have money from almost anywhere in their pockets. The exchequer did this using an exchequer, which is defined as a calculation board used by an exchequer. This is like how a casserole is any dish that is baked and served in a casserole dish. Writing about how to use an exchequer is already on my to do list, but if anyone in the Kingdom's Coiner's Guild wishes to write about it, I would be happy to share the spot light.

Buying a cheap horse from a local seller was normally done with coins, but buying a expensive horse from the other side of Europe was normally done with Marks, or with letters of credit that could be redeemed for a named weight of silver. Marks continued to be used for international accounting until the early 16th Century when new coinage were created for high denominations, minted in gold. But, that will be a more complicated deep dive because everyone kind of went nuts with making new coins. Gold became more common, in Europe, as the new world was looted of everything shiny. The Spanish and Portuguese crowns were using that gold to buy influence across Europe, and gold coins can always be melted down and re-minted.
I hope this helps puts things into perspective when you do your research and come across prices in Marks. Now, back to researching sumptuary laws.