Archaeology
LiDAR reveals sprawling medieval fortress
A LiDAR survey of Castro Valente, an archaeological site that straddles the province of A Coruña and the province of Pontevedra in Spain, has been revealed to be a sprawling early medieval fortress from the 5th to the 7th century AD.
Light Detection and Ranging (LiDAR), is a method of remote sensing using light in the form of a pulsed laser to measure ranges (variable distances) to the Earth.
The differences in the laser return times and measuring the wavelengths can be used to compile a 3-D digital map of the landscape, removing obscuring features such as tree canopies that could hide archaeological features.
Castro Valente was previously thought to be an Iron Age fortified enclosure settlement on a 1,300-foot-high hillock, first mentioned in 19th and 20th century publications that refer to the site dating from between 1500 and 500 BC.
A LiDAR survey conducted by archaeologists from the University of Santiago de Compostela, has revealed that the site is a large medieval fortress covering an area of 30 acres, surrounded by a defensive wall spanning three-quarters of a mile, and a series of 30 towers in a similar style to the 3rd century Roman walls that defended the town of Lugo in Spain.
A ground survey has determined that the walls were built with double-leaf masonry construction and has a thickness varying between 8 to 14 feet. The survey also confirmed 6 towers at ground level, a seventh that has been destroyed with the creation of a fire trail, and entrances to the fortress interior.
The team believe that they have identified several interior structures made from perishable materials and stone, with excavations also revealing brick and tiles from the Roman period, and small fragments of red-paste ceramics.
A report on the survey states: “The results have allowed us to document the construction technique of the defensive system and locate a possible wall-like structure belonging to an intramural building. In the survey carried out in one of the [towers], a large number of fragments of [tiles] was recorded, which makes us think that this tower could have been covered by these pieces of Roman tradition.”
The study is the first in what will be further exciting steps to determine the true nature of the site, however, the remains of the fortress are now under threat by an impending installation of four wind turbines, six electrical towers and an electrical substation.
University of Santiago de Compostela
Header Image Credit : University of Santiago de Compostela
This content was originally published on www.heritagedaily.com – © 2023 – HeritageDaily
A study of archaeological sites in Winchester, England, has revealed that red squirrels served as a host for Mycobacterium leprae strains that caused leprosy in people.
Leprosy is one of the oldest recorded diseases in human history and is still prevalent to this day in Asia, Africa, and South America.
It has previously been suggested that the extensive trade of red squirrel fur, greatly valued during medieval times, could have contributed to the leprosy epidemic in medieval Europe.
The results of the study, published in the journal Current Biology, studied 25 human and 12 squirrel samples from two medieval sites in Winchester.
During this period, the city had strong connections to the fur trade and housed the leprosarium, a hospital that treated people with Hansen’s disease (leprosy) caused by Mycobacterium leprae bacteria.
Verena Schuenemann of the University of Basel in Switzerland, said: “With our genetic analysis we were able to identify red squirrels as the first ancient animal host of leprosy.”
The study found that the medieval red squirrel strains were more closely related to human strains in Winchester, rather than to modern squirrel strains from England – suggesting an independent circulation of Mycobacterium leprae strains.
“Our findings highlight the importance of involving archaeological material, in particular animal remains, into studying the long-term zoonotic potential of this disease, as only a direct comparison of ancient human and animal strains allows reconstructions of potential transmission events across time,” says Sarah Inskip of the University of Leicester, UK, a co-author on the study.
Header Image Credit : Shutterstock
Sources : Current Biology, Urban, Blom, and Avanzi et al.: “Ancient Mycobacterium leprae genome reveals medieval English red squirrels as animal leprosy host.” https://www.cell.com/current-biology/fulltext/S0960-9822(24)00446-9
This content was originally published on www.heritagedaily.com – © 2023 – HeritageDaily
Archaeologists from the Uncovering Roman Carlisle project have discovered a rare lump of Tyrian purple at the grounds of the Carlisle Cricket Club in Carlisle, England.
The project is a community supported excavation by Wardell Armstrong, focusing on uncovering a Roman bath house found in 2017.
The bath house is located near the Roman fort of Uxelodunum (meaning “high fort”), also known as Petriana, in the Carlisle district of Stanwix.
Uxelodunum was constructed to control the territories west of present-day Carlisle and an important crossing on the River Eden. The fort was garrisoned by the Ala Petriana, a 1,000-strong cavalry unit, whose members were all granted Roman citizenship for valour on the field.
Previous excavations at the bath house have discovered colossal sandstone heads depicting Roman gods, in addition to engraved gems known as intaglios, figurines, animal bones, and imperial-stamped tiles.
During the latest season of excavations, archaeologists found a mysterious lump of a soft purple substance. The substance was tested by researchers from Newcastle University, revealing that it contained levels of Bromine and beeswax.
According to the researchers, the substance is Tyrian purple, a coloured dye associated with the Imperial Court in the Roman Empire. Tyrian purple is secreted by several species of predatory sea snails in the family Muricidae, rock snails originally known by the name Murex.
Frank Giecco, Technical Director at Wardell Armstrong, said: “For millennia, Tyrian Purple was the world’s most expensive and sought after colour. It’s presence in Carlisle combined with other evidence from the excavation all strengthens the hypothesis that the building was in some way associated with the Imperial Court of the Emperor Septimius Severus which was located in York and possibly relates to an Imperial visit to Carlisle.”
“It’s the only example we know of in Northern Europe – possibly the only example of a solid sample of the pigment in the form of unused paint pigment anywhere in the Roman Empire. Examples have been found of it in wall paintings (like in Pompeii) and some high status painted coffins from the Roman province of Egypt,” said Giecco.
Header Image Credit : Wardell Armstrong
Sources : Wardell Armstrong
This content was originally published on www.heritagedaily.com – © 2023 – HeritageDaily
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