The ''opus gallicum'' (
Latin
Latin (, or , ) is a classical language belonging to the Italic branch of the Indo-European languages. Latin was originally a dialect spoken in the lower Tiber area (then known as Latium) around present-day Rome, but through the power of the ...
for "Gallic work") was a technique of construction whereby precise holes were created in stone masonry for the insertion of wooden beams to create a wooden infrastructure. The technique was so named because, though its presence is attested in protohistoric times, its use was common enough in
Gaul
Gaul ( la, Gallia) was a region of Western Europe first described by the Romans. It was inhabited by Celtic and Aquitani tribes, encompassing present-day France, Belgium, Luxembourg, most of Switzerland, parts of Northern Italy (only during ...
to merit mention in
Julius Caesar's ''
Commentarii de Bello Gallico
''Commentarii de Bello Gallico'' (; en, Commentaries on the Gallic War, italic=yes), also ''Bellum Gallicum'' ( en, Gallic War, italic=yes), is Julius Caesar's firsthand account of the Gallic Wars, written as a third-person narrative. In it C ...
'' and was frequently employed in the
Merovingian
The Merovingian dynasty () was the ruling family of the Franks from the middle of the 5th century until 751. They first appear as "Kings of the Franks" in the Roman army of northern Gaul. By 509 they had united all the Franks and northern Gauli ...
era. The technique was imported by the
Normans
The Normans ( Norman: ''Normaunds''; french: Normands; la, Nortmanni/Normanni) were a population arising in the medieval Duchy of Normandy from the intermingling between Norse Viking settlers and indigenous West Franks and Gallo-Romans. ...
into the
Molise
it, Molisano (man) it, Molisana (woman)
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, where it was used extensively in the raising of
castles in a short time. Gaulish masons are even known to have brought the technique from Merovingian Francia to
Anglo-Saxon England
England is a country that is part of the United Kingdom. It shares land borders with Wales to its west and Scotland to its north. The Irish Sea lies northwest and the Celtic Sea to the southwest. It is separated from continental Europe b ...
during the 7th and 8th centuries and employed it in
church architecture.
The ''opus gallicum'' served not only as an infrastructural base, but also a
superstructural binding element designed to strengthen the masonry. While the arrangement of some of the holes found in preserved structures is often perplexing, leaving doubt as to the exact function of the beams, modern scholarship has largely moved away from the theory that the ''opus gallicum'' was a rare and inefficient method. Overall the technique was not uncommon in the Middle Ages.
Sources
*
European Commission
The European Commission (EC) is the executive of the European Union (EU). It operates as a cabinet government, with 27 members of the Commission (informally known as "Commissioners") headed by a President. It includes an administrative body ...
: Raphaël Programme. ''The Normans, a European people: The Norman heritage, 10th – 12th century''. Architectural Heritage: Italy — the Molis
§8 Fortifications and castles: Fortifications — The opus gallicum in the fortifications.2004. Contains photographs of Molisian examples.
*Gravett, Christopher, and Nicolle, David. ''The Normans: Warrior Knights and their Castles''. Osprey Publishing: Oxford, 2006.
*Gilbert, Edward
"Brixworth and the English Basilica."''The Art Bulletin'', Vol. 47, No. 1. (Mar., 1965), pp 1–20.
Roman construction techniques
Masonry
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