Archaeologists at Lund University in Sweden have found carbonised
germinated grains showing that malt was produced for beer brewing as
early as the Iron Age in the Nordic region. The findings made in Uppåkra
in southern Sweden indicate a large-scale production of beer, possibly
for feasting and trade.
"We found carbonised malt in an area with low-temperature ovens
located in a separate part of the settlement. The findings are from the
400-600s, making them one of the earliest evidence of beer brewing in
Sweden", says Mikael Larsson, who specialises in archaeobotany, the
archaeology of human-plant interactions.
Archaeologists have long known that beer was an important product in
ancient societies in many parts of the world. Through legal documents
and images, it has been found, for example, that beer was produced in
Mesopotamia as early as 4 000 BCE. However, as written sources in the
Nordic region are absent prior to the Middle Ages (before ca 1200 CE),
knowledge of earlier beer production is dependent on botanical evidence.
"We often find cereal grains on archaeological sites, but very
rarely from contexts that testify as to how they were processed. These
germinated grains found around a low-temperature oven indicate that they
were used to become malt for brewing beer", says Mikael Larsson.
Beer is made in two stages. The first is the malting process,
followed by the actual brewing. The process of malting starts by wetting
the grain with water, allowing the grain to germinate. During
germination, enzymatic activities starts to convert both proteins and
starches of the grain into fermentable sugars. Once enough sugar has
been formed, the germinated grain is dried in an oven with hot air,
arresting the germination process. This is what happened in the oven in
Uppåkra.
"Because the investigated oven and carbonised grain was situated in
an area on the site with several similar ovens, but absent of remains to
indicate a living quarter, it is likely that large-scale production of
malt was allocated to a specific area on the settlement, intended for
feasting and/or trading", explains Mikael Larsson.
Early traces of malt in connection with beer brewing have only been
discovered in two other places in the Nordic region. One is in Denmark
from 100 CE and one is in Eketorp on Öland from around 500 CE.
"From other archaeological sites in the Nordic region, traces of the
bog-myrtle plant have been found, which indicates beer brewing. Back
then, bog-myrtle was used to preserve and flavour beer. It wasn't until
later during the Middle Ages that hops took over as beer flavouring",
Mikael Larsson concludes.
Facts: Method
Two-litre soil samples are taken from various archaeological
contexts - in houses, in pits, around hearths and ovens. The plant
material found is usually preserved in a carbonised state. The soil is
mixed with water and the carbon rises to the surface and is sieved
through a fine mesh. The particles extracted are dried and studied under
a microscope.
Facts: Uppåkra
Uppåkra is currently the largest Iron Age settlements in southern
Scandinavia and served as a densely populated political and religious
centre of power for more than 1 000 years, from 100s BCE to the 1 000s
CE. The many findings made of imported luxury items such as jewellery
and glass bowls, and from a developed production of crafts, indicate
that the location was both rich and a significant trading centre.