Bart Holterman, 22 December 2016
For most readers of our blog, probably the most mysterious part of our research is the work of Hans Christian Küchelmann, archaeozoologist, who uses archaeological finds of fish bones as traces of the late medieval North Atlantic (stock)fish trade. A fish bone found in the ground, however, does not say where the fish once came from or to which fish it belonged. So, how can one identify a stockfish merely by its bones? This blog post will shed a light on that mysterious procedure.
1. Stockfish production
In order to be able to identify a stockfish bone, it is essential to know how stockfish was produced. Luckily, stockfish is made in Iceland and Northern Norway to this day in ways that have hardly changed over the centuries, so in combination with historical sources, we can reliably reconstruct what a medieval stockfish must have been like.
Stockfish is made in polar regions from fish from the Gadidae family where they are hung to dry outside during the winter. Due to climatic conditions this is only possible in arctic regions as the cool weather prevents the fish from rotting before it dries. However, the entrails must be removed before the fish is hung to dry, and the heads are cut off. This is roughly done with two methods: a) the fish is gutted and beheaded, the rest of the body left intact (rundfisk), or b) the fish is beheaded and split in two, removing the entrails as well as most of the spinal column, and then hung to dry. The latter method is called råskjær in Norwegian (rotscher in the Low German medieval documents). As this leaves only a few caudal (tail) vertebrae in the stockfish, most bones of stockfish will come from rundfisk.
2. Species and distribution
As mentioned, stockfish was made from species of the Gadidae family. A trained eye will have no problem recognising a bone from a Gadidae fish in most cases. Due to long travel times and the absence of freezers in pre-industrial times, these fish could only be transported in preserved form, either salted or dried. Hence, a find of a Gadidae bone, especially on inland sites, hints at having belonged to a stockfish.
However, in coastal areas these fish were also eaten fresh, so how do you know a bone is from stockfish in that case? It is necessary to look at the distribution of the different Gadidae species. Three of the species that were used for producing stockfish, namely saithe (Pollachius virens), ling (Molva molva), and tusk (Brosme brosme) do not appear in the Southern North Sea and Baltic Sea. Bones from these three species found on the European mainland, especially in inland areas, are therefore a strong indicator for stockfish.
By far most of the stockfish, however, is and was made from cod (Gadus morhua), which does live in the Southern North Sea and the Baltic Sea. Bones of cod could therefore also belong to locally caught (and therefore not dried) fish. So we need another indicator to distinguish a stockfish from fresh local cod. The cod which live around the German shores are mostly smaller juveniles, older and larger fish live further North. By comparing the size of the bones to those of complete skeletons it is possible to estimate the size of the fish they belonged to. Bones belonging to fish larger than c. 75cm are less likely to have been local catch and were probably imported in dried form. Moreover, a high prevalence of fish in a specific size range is an indicator of stockfish, as these were sorted and sold according to size, whereas local catches will likely show a higher variety of fish in different sizes.
4. Bone composition
Because the head of the fish was cut off and remained at the production site one can expect head bones to be absent at consumption sites. Indeed, we find a clear overrepresentation of post-cranial (i.e. bones not belonging to the head, from cranium: head) bones on some sites in mainland Europe. On some archaeological sites in Iceland, for example, there are almost only cranial bones which is a clear sign that stockfish was produced there.
5. Cutting and hammering marks
The production and consumption of stockfish can also leave traces on the bones themselves. For example, the heads of fish were chopped of in a standardised way, leaving clear-cut chopping edges on the bones of the shoulder girdle directly behind the head. Also, the preparation of stockfish required hammering the fish for a while before soaking it, to make the flesh softer. As we have seen from our own experiences in preparing stockfish, this procedure can destroy or deform the vertebrae of the fish. Hence, deformed or broken vertebrae can be a sign of stockfish consumption in the archaeological record.
6. Isotope and aDNA analysis
Further, more advanced evidence from the North Atlantic stockfish trade can be acquired by applying methods such as aDNA analysis and isotope analysis, which can potentially retrace the remains of an animal to the area in which it lived. However, an explanation of these techniques might be a topic for a next post.
Barrett, James H. (2009): Cod bones and commerce: the medieval fishing revolution. – Current Arrchaeology 221, 20-25
Heinrich, Dirk (1986): Fishing and the Consumption of Cod (Gadus morhua Linnaeus, 1758) in the Middle Ages. in: Brinkhuizen, Dick Constantijne & Clason, Anneke T. (eds.): Fish and Archaeology.
Ólafsdottir, Gudbjörg Ásta / Westfall, Kristen M. / Edvardsson, Ragnar / Pálsson, Snæbjörn (2014): Historical DNA reveals the demographic history of Atlantic cod (Gadus morhua) in medieval and early modern Iceland. – Proceedings of the Royal Society of London B 281
Orton, David C. / Morris, James / Locker, Alison / Barrett, James H. (2014): Fish for the city: meta-analysis of archaeological cod remains and the growth of London’s northern trade. – Antiquity 88, 516-530
Posted in: General
Natascha Mehler, 19 October 2016
In the 16th and 17th centuries, the North Atlantic islands of Iceland, Shetland, and to some extent also Faroe, were closely tied to the cities of Bremen and Hamburg. Merchants from these hanseatic cities regularly travelled North to exchange goods such as grain / flour, beer, timber and tools for stockfish and sulphur. In the second half of the 16th century about 500 to 750 merchants, sailors, craftsmen, priests and others from Hamburg and Bremen spent their summers in Iceland. On the other hand, a considerable number of Icelanders used Hamburg and Bremen ships to travel to the continent, e.g. to be educated in jurisprudence or theology at the universities in Copenhagen, Rostock and Wittenberg. They brought back new knowledge that changed the insular societies.
The German presence on the islands and the stay of islanders in Northern Germany had a profound impact on the North Atlantic insular societies. Tracing this impact will be the main aim of an interdisciplinary research seminar that takes place from 26 to 28 October 2016 at the museum Schwedenspeicher in Stade near Hamburg. It is organized in cooperation with the archive Stade and the museum Schwedenspeicher Stade.
The main aim of this seminar is to trace and disentangle the forms of impact. The topics and questions we want to discuss during the seminar include:
- What role did the German connections play in the assertion of the reformation in Iceland, Shetland and Faroe? What was the position of the Danish and Scottish crown? How did religious life change on the island?
- What was the cultural effect of the reformation and how did the new scholarship change the insular societies? How did knowledge transfer happen?
- What role did hanseatic measurements (e.g. the Hamburg ell) and coinage (e.g. Reichsthaler) play on the islands and how were their values converted into the Icelandic, Faroese and Shetland value system? Did the different value systems effect the economic connections?
For more information on the seminar click here to download the flyer for the cultural-impact-research-seminar.
Posted in: Announcements
Natascha Mehler, 11 August 2016
Throughout the medieval and early modern period, Icelandic gyrfalcons were highly valued at the courts of European rulers and they were worth a fortune. Indeed, Frederick II (1194-1250), Holy Roman Emperor, already noted in his treatise De arte venandi cum avibus that the best falcons for use in falconry were gyrfalcons (…et isti sunt meliores omnibus aliis, Girofalco enim dicitur). The reason for this was that of all falcon species, gyrfalcons (Falco rusticolus) are the largest and most powerful. Their plumage varies greatly from completely white to very dark, of which the white variety was the most valued hawking bird in the Middle Ages, and still is today. They only inhabit sub-arctic and arctic areas, with their highest population density in Iceland (one pair per 150-300 km²). During the breeding season (roughly February to June) there are today 200-400 nesting pairs in Iceland, and in the winter the population increases to 1.000-2.5000 individuals, due to migrating birds from Greenland.
Written sources from the 16th century, when German merchants from Hamburg and Bremen dominated the trade with the North Atlantic islands, give us a better insight into the falcon business with Iceland. Matthias Hoep, a Hamburg merchant, has left behind a collection of account books (1582-1594) which show us that he traded in many commodities such as fish, timber, and tools, and specialized in the trade of falcons. Hoep employed falcon catchers to catch birds in Iceland for him and he made specific contracts with them. The books record a great number of falcons and other birds of prey that he bought from falcon catchers and which he then sold on. On 5 April 1584, Hoep made a contract with the falcon catchers and brothers Augustin and Marcus Mumme which he commissioned to travel to Iceland to catch falcons. The contract specified the bird species, the conditions of the birds upon delivery, and the prices Hoep was going to pay after the successful return of the Mummes from Iceland:
“On 5 April  I have dealt in my house with Augustin and Marcus Mumme, in the name of god, that they shall sail to Iceland in the name of god, and we agreed that I will give for each pair of falcons 11 ½ daler, and 2 tercel [male falcons] for 1 falcon, and what is blank shall be counted as a red [unmoulted] falcon. But what is white and moulted once, or moulted twice and beautiful, for those I shall give them 20 daler for each falcon and 10 daler for a tercel. But what has moulted three times we shall agree upon with good will, and if god and luck provides them with white falcons, I will give the one who catches them black cloth for a jacket of 2 ½ ells, all of this is validated with a denarius dei of 1 sosling each, and both brothers have promised with an oath to bring the best birds they can get and to take no birds away, neither in Iceland nor during the journey back, until they have all been delivered to me.“
Roughly five months later, in September 1584, the brothers returned from Iceland and handed over 49 birds to Matthias Hoep.
Later documents tell us how the shipping of the falcons was done. During the 17th century, a Danish falcon ship went to Iceland annually to transport falcons from Iceland to Copenhagen. The falcons were kept below the deck and sat on poles which were lined with vaðmál. During the journey, the birds were fed with meat of cattle, sheep or birds, dipped in milk, and when they were sick, they were fed with a mix of eggs and (fish) oil. Upon arrival of the birds in Hamburg, Mathias Hoep checked their health and quality and he considered them in good state after they had eaten three times and their feathers were not broken.
Most of the birds that Hoep received were sold to English merchants such as John Mysken who bought 55 birds of prey in 1584 and had them shipped to England, most likely to be sold to the English court. It is likely that Hoep also had good contacts with Icelanders, both in Iceland and in Hamburg. His professional network may have included Magnús Jónsson (c. 1530-1591), who had studied law in Hamburg, probably until 1556. In Iceland he became chieftain and sýslumaður (sheriff) at Þingeyjaþingssýsla and Ísafjarðarsýsla, districts in the North of Iceland with a very high density of falcons. No wonder his seal from the year 1557 shows a gyrfalcon in the centre.
In the second half of the 16th century, king Frederick II of Denmark-Norway (1559-1588) started to regulate the export of falcons to foreign countries. From the 1560s onwards, foreign falcon catchers needed to buy a permission (Icel. fálkabréf, falcon letter) to catch falcons.
Were falcons also caught in Shetland or the Faroes?
We have not found any written evidence for that. The obvious reason for this is that there are not many falcons around in Shetland and the Faroes. Gyrfalcons only appear as vagrant birds, and peregrine falcons (Falco peregrinus) exist in Shetland only in small numbers. However, it is worth pointing out that in the years 1601 to 1606 one Tonnies Mumme is recorded to have sailed each summer from Hamburg to Shetland. We do not know whether this is the same Tonnies Mumme that is reported as falcon catcher in Iceland in previous years, or whether Tonnies is related to the Augustin and Marcus Mumme mentioned above, but it seems very likely. He may have tried his luck in Shetland, or might have changed his profession and have traded in other items.
Natascha Mehler, Hans Christian Küchelmann and Bart Holterman, The export of gyrfalcons from Iceland during the 16th century. A boundless business in a proto-globalized world. In K.-H. Gersmann and O. Grimm (eds.), Raptor and Human – Bird Symbolism and Falconry through five millennia on a global scale. Centre of Baltic and Scandinavian Archaeology Monographs (in press).
Kurt Piper, Der Greifvogelhandel des Hamburger Kaufmanns Matthias Hoep (1582-1594). Jahrbuch des Deutschen Falkenordens 2001/2002, 205-212.
Björn Þórðarson, Íslenzkir fálkar. Safn til sögu Íslands og íslenskra bókmennta (Reykjavík 1957).
Posted in: Stories
Bart Holterman, 13 May 2016
The general history of the northern German trade with the North Atlantic is relatively well known but we know very little about the persons involved in this trade. This is especially true for the men that manned and sailed the ships that headed North.
Luckily, there are a couple of sources pertaining to the North Atlantic trade that give us a good insight into the people on board the ships. First, two boarding lists from Oldenburg for ships trading with Iceland in the 1580s have survived. Second, there is the magnificent book of donations of the Hamburg confraternity of St Anne, the socio-religious organisation behind the trade with Iceland, Shetland, and the Faroe Islands. From the 1530s onwards, the register lists the alms spent to the confraternity by the people on board of nearly every ship that returned to Hamburg, resulting in a more or less complete register of boarding lists.
From these sources we can learn that the number of people on board varied greatly, ranging from 77 on larger ships up to around 10 on board the smallest vessels. For Iceland, it was not uncommon to have more than 25 people on board. Ships sailing to Shetland and the Faroe Islands had less people on board, usually 15-20.
This difference in number of people on board was mainly caused by the number of merchants on board. The sizes of the crews were relatively similar on each ship, because 10 to 15 people were needed to sail the ship, regardless of its size. A typical crew consisted of:
– Skipper (schipper). He was the captain, the leader of the ship, often also one of the merchants, and (partly) shipowner.
– Helmsman (sturman), the one who steered the ship and had navigational knowledge.
– Chief boatswain (hovetbosman), the leader of the sailors.
– Schimman, the officer responsible for rigging and other technical things.
– Cook (koch).
– Carpenter (tymmerman), responsible for repairs to the ship.
– Gunner (buchsenschut), responsible for the defense of the ship.
– Barber (bartscher), who had medical knowledge, but lacked on most ships.
– 2-4 sailors (bosman).
– 1-2 ship boys (putker), young sailors in training.
Besides these, ships transported merchants and their servants, falcon catchers, priests, and passengers from the islands which used the regular traffic to travel to and from the European mainland.
B. Holterman, Size and composition of ship crews in the German trade with the North Atlantic islands. In: N. Mehler (ed.), Traveling to Shetland, Faroe and Iceland in the early modern period (Leiden, in press).
F. C. Koch, Untersuchungen über den Aufenthalt von Isländern in Hamburg für den Zeitraum 1520-1662. Beiträge zur Geschichte Hamburgs 49 (Hamburg 1995).
Natascha Mehler, 12 April 2016
When it comes to the goods transported by merchants from Bremen and Hamburg to the North Atlantic islands we have only limited sources at hand. The few extant account books list the commodities they sold to the inhabitants of the islands in return for stockfish, fish oil, sulphur or woolen cloth. But the written sources are not precise but rather general and never tell where the exported goods were manufactured. To complicate matters, (archaeological) material culture of the German period is scarce. Most of the goods traded by the Germans were bulk material such as grain or flour, cloth, timber, and beer, and to a lesser extent every day items that were hard to get on the islands: horse shoes, tools, knifes, wax etc. Many of these goods, especially those of organic material, have long been gone. Ceramics, however, are a different matter. Icelanders did not produce ceramic vessels (and the Faroese and Shetlanders only to a limited extent) which means that all pots, pans, jugs and beakers needed to be imported. A considerable amount of pottery from the 15th to 17th centuries has been found in Iceland, Shetland and Faroe but what can pottery sherds tell us about that trade?
The sherds that have survived from excavations and in museum collections in Iceland show characteristic traits of wares common in Northern Europe. The ceramic assemblages of sites such as Gautavík (a German trading site in the East), Viðey (a monastery near Reykjavík), or Stóraborg (a farm at the South coast) consist of two distinctive ware groups: stonewares and redwares. Stoneware was used to produce drinking vessels such as jugs and beakers. They were widely traded over Northern Europe, via the river Rhine and ports of Northern Germany and the Netherlands. For the trained eye, these stonewares are relatively easy to determine. The majority stems from the famous medieval and early modern production centres along the Rhine such as Siegburg, Frechen, or Cologne; a second group can be traced back to Lower Saxony.
The origin of redwares, a general term for cooking vessels (pots, pans) and plates consisting of earthenware, is far more problematic to identify. Vessel shapes and fabrics of pottery workshops are generally very similar over a large area and it is therefore hard to determine where exactly a certain redware pot was produced. Distinguishing the redwares is mostly based on typological characteristics such as a distinctive form of the rim of a pot, but the Icelandic archaeological material is often too fragmented to allow an identification beyond doubts. However, provenancing these redwares would considerably change our understanding of the trade mechanisms and pottery consumption patterns in the North Atlantic.
Luckily, there are other methods than typology to identify the provenance of pottery. In recent years, ICP analysis (inductively coupled plasma mass spectrometry), widely used in archaeological science, has proven to be a reliable method to determine the chemical fingerprint of the clays used for the production of ceramic vessels. ICP analysis has been applied successfully at a large number of redwares produced in Southern Scandinavia and Germany, with ground breaking work done by Torbjörn Brorsson (Kontoret för Keramiska Studier, Sweden) and Jette Linaa (Moesgaard Museum, Denmark). This means that we now have a solid base of reference material at hand which is necessary to securely identify the origin of the redwares in question. The application of the method in ceramic studies and an overview on the data reference material was presented in April 2016 at the inaugural meeting of the Baltic and North Atlantic Pottery Research Group (BNPG) which took place at the Historiska Museet Stockholm.
In summer 2016, redware fragments from selected sites in Iceland, Shetland and Faroe will be sampled in order to conduct ICP analysis. We will report on the results of the analysis, and what this means for the interpretation of the trading connections between Northern Germany and the North Atlantic islands.
Torbjörn Brorsson, A new method to determine the provenance of pottery – ICP analysis of pottery from Viking age settlements in Northern Europe. In: S. Kleingärtner, U. Müller, J. Scheschkewitz (eds.), Kulturwandel im Spannungsfeld von Tradition und Innovation. Festschrift for Michael Müller-Wille. Neumünster, 2013, 59-66.
Adolf Hofmeister, Das Schuldbuch eines Bremer Islandfahrers aus dem Jahre 1558. Bremisches Jahrbuch 80, 2001, 20-50.
Natascha Mehler, Die mittelalterliche Importkeramik Islands. Current Issues in Nordic Archaeology. Proceedings of the 21st Conference of Nordic Archaeologists, 6-9 September 2001, Akureyri, Iceland. Reykjavik 2004, 167-170.