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Castlelaw is an Iron Age fort and souterrain located in Midlothian, Scotland. The fort occupies a defensible position built upon Devonian volcanic bedrock, formed from ancient mafic lava and tuff deposits that create a naturally elevated and stable foundation. The souterrain, an underground stone-lined passage characteristic of Iron Age settlement in eastern Scotland, extends beneath the fort's ramparts. This combination of surface fortification and subterranean structure reflects the sophisticated defensive and domestic planning of Iron Age communities in the Lothian region.
The fort itself comprises concentric ramparts that exploit the natural topography of the volcanic geology, enhancing its defensive capability against contemporary threats. The souterrain would have served multiple functions within the settlement, potentially providing secure storage for grain and valuables, refuge during conflict, or specialised craft activities. The preservation of both structures together offers rare insight into the complete settlement pattern of the period.
The monument is protected by Historic Environment Scotland under reference SM90064, recognising its archaeological significance and the potential for future study to illuminate Iron Age life and social organisation in Midlothian. The combination of fort and souterrain at Castlelaw remains an important surviving example of this settlement type in the region.
Castlelaw, fort and souterrain 205m NNW of is a scheduled monument protected by Historic Environment Scotland under reference SM90064. View the official record →
Castlelaw is an Iron Age fort and souterrain located in Midlothian, Scotland. It is designated a Scheduled Ancient Monument by Historic Environment Scotland under reference SM90064.
Castlelaw, fort and souterrain 205m NNW of dates from the iron age period, and is classified as a fort and souterrain. It is one of over 32,000 scheduled monuments protected across the UK.
Castlelaw, fort and souterrain 205m NNW of is a Scheduled Ancient Monument, legally protected by Historic Environment Scotland — the body responsible for designating and safeguarding heritage sites in Scotland. The official designation reference is SM90064.
Several scheduled monuments lie within 10 km, including Carnethy Hill,cairn,Silverburn (3.2 km), Old Woodhouselee Castle (3.6 km), Penicuik,St Kentigern's Church & Clerk Mausoleum (4 km).
This page is just one thread. A full Aubrey report pulls together 14 strands of Castlelaw, fort and souterrain 205m NNW of's history, each drawn from the record and mapped to the exact spot:
Every location is different. Not every section appears for every place, only what the historical record actually holds turns up in a report.
Castlelaw, fort and souterrain 205m NNW of stands on Unnamed Extrusive Rocks, Silurian To Devonian, bedrock that formed in the Devonian. The rock here is mafic lava and mafic tuff.