Drawn to the mysteries of Scotland’s ancient past? The story of Crannog takes us back millennia. Crannogs are artificial islands. They were usually built in lakes and estuarine waters. These unique structures are found throughout Scotland and Ireland.
Crannogs served as dwellings. They were used over five millennia from the Neolithic Period to the 17th century. In Scotland, archaeological evidence suggests use from the Late Bronze Age to the Early Iron Age around 800 BC.
The word “crannog” comes from the Old Irish word “crannóc”. It refers to a wooden structure. “Crann” means tree. The suffix “-óg” is a diminutive ending. The term first appeared around the 12th century. It gained popularity in the medieval period. There is some confusion about what the term “crannog” originally referred to. Was it the structure or the island itself?
Crannogs are widespread in Ireland. There are an estimated 1200 examples. Scotland has 389 officially listed sites. The actual number in Scotland varies between 350 and 500. This depends on the definition. Previously unknown crannogs in Scotland and Ireland are still being found. Underwater surveys continue to investigate loch beds.
The largest concentrations of crannogs in Ireland are in the Drumlin Belt. In Scotland, they are mostly on the western coast. One lone Welsh example exists at Llangorse Lake. It is probably a product of Irish influence. Today, crannogs appear as small circular islets. They are often covered in dense vegetation. This is due to their inaccessibility to grazing livestock.
Crannogs took on many different forms. Construction depended on the available landscape. The classic image is a small islet. It is surrounded by timber piles and a gangway. It is topped by an Iron Age roundhouse. Waterways were the main channels for communication. They were crucial for travel until the 19th century. Crannogs are interpreted as farmsteads. They could have been boltholes. They may have been status symbols. They may have been inherited locations of power.
A strict definition requires the use of timber. Hebridean island dwellings were built on natural and artificial islets. These are often reached by a stone causeway. These visible remains are interpreted as duns.
Most early crannog excavations were poorly conducted. They were done by antiquarians. Some were accidental finds. Lochs were drained to increase farmland. Labourers hauled away tons of materials. They had little regard for anything not of economic value. Preservation techniques were non-existent. Some important finds were destroyed. They were even dried out for firewood.
From 1900 to the late 1940s, there was little crannog excavation in Scotland. Since World War II, the number has grown. The majority of crannogs show multiple phases of occupation. This often extends over centuries.
Interpretations of crannog function have changed. Medieval crannogs were strongholds of the upper class. They were regional political players. This is documented into the early 18th century in Scotland.
The earliest known constructed crannog is Eilean Dòmhnuill. It is on North Uist in Scotland. It dates from 3650 to 2500 BC. Irish crannogs appear in middle Bronze Age layers.
Crannog construction peaked in Scotland from about 800 BC to AD 200. They have defensive properties. In Ireland, they were at their zenith during the Early Historic period. They were the homes of kings and lords. They housed farmers. They sheltered marginalized groups.
Construction techniques varied. Typically, it began on a shallow reef in the loch bed. Many crannogs were surrounded by wooden piles. These formed a circular enclosure. It helped to retain the mound and prevent erosion. Interior surfaces were built up with clay, peat, stone, timber, or brush. In some instances, more than one structure was built.
Builders added large stones to the waterline of natural islets. This extended and enlarged them. Larger crannogs could be occupied by extended families. Access was by logboats or coracles. Organic remains are often found in excellent condition.
Crannogs offer a fascinating glimpse into the lives of our ancestors. They reveal their ingenuity and resilience. They show their connection to the water.