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Antonine Wall, Girnal Hill to B802 road, Croy is a section of the second-century Roman frontier that extends across northern Britain from the Firth of Forth to the Firth of Clyde. Built around AD 142 under the emperor Antoninus Pius, this turf and stone rampart served as the northernmost boundary of the Roman Empire for approximately forty years. The monument here runs through Dunbartonshire, crossing Carboniferous and Permian dolerite and tholeiitic basalt bedrock, which would have presented considerable engineering challenges during construction but also provided stable foundations for the wall's defensive structure.
This particular stretch between Girnal Hill and the B802 road preserves a significant length of the wall's course through the landscape, demonstrating how Roman engineers adapted their construction techniques to Scotland's varied terrain. The wall typically stood around three metres high above a substantial foundation ditch, and archaeological evidence across its length reveals evidence of regular fortlets, signal stations and associated military installations that maintained control of the barrier.
The Croy section benefits from protection under Historic Environment Scotland's designation SM7528, safeguarding this important example of Roman Britain's most remote military frontier. The monument remains a valuable record of Roman military ambition and engineering capability in northern Britain during the 2nd century AD.
Antonine Wall, Girnal Hill to B802 road, Croy is a scheduled monument protected by Historic Environment Scotland under reference SM7528. View the official record →
Antonine Wall, Girnal Hill to B802 road, Croy is a section of the second-century Roman frontier that extends across northern Britain from the Firth of Forth to the Firth of Clyde. It is designated a Scheduled Ancient Monument by Historic Environment Scotland under reference SM7528.
Antonine Wall, Girnal Hill to B802 road, Croy 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 SM7528.
Several scheduled monuments lie within 10 km, including Antonine Wall, E edge of Strone Plantation to Girnal Hill (0.4 km), Antonine Wall, Bar Hill, rampart, ditch, fort and Military Way (1.1 km), Bar Hill, Roman temporary camp SW of (1.5 km).
This page is just one thread. A full Aubrey report pulls together 14 strands of Antonine Wall, Girnal Hill to B802 road, Croy'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.
Antonine Wall, Girnal Hill to B802 road, Croy stands on Unnamed Igneous Intrusion, Carboniferous To Permian, bedrock that formed in the Permian. The rock here is dolerite and tholeiitic basalt.