Bertha was a Roman auxiliary fort situated at the confluence of the Rivers Tay and Almond, just north of modern Perth. Established around AD 83 during Agricola's Caledonian campaigns, it covered approximately 9.5 acres (3.8 ha), making it a substantial installation, and likely functioned as a supply base linked to the Gask Ridge frontier system and the legionary fortress at Inchtuthil. Occupation was probably brief in its first phase, ending with the Flavian withdrawal around AD 87, with possible Antonine-period reuse.
Source: Pleiades — A Community-Built Gazetteer and Graph of Ancient Places. View the Pleiades record →
Bertha occupied a strategically vital position controlling the lowest fordable crossing of the Tay and the entrance to Strathmore, making it a key node for moving troops and supplies between southern Scotland and the Highland-edge garrisons. Its riverine location also suggests it served as a transhipment point where waterborne supplies were transferred to land routes serving forts further north.
The site has been heavily eroded by the Tay and built over, so investigation has been limited; aerial photography and small-scale excavation have revealed defensive ditches, ramparts, and parts of the gate structures, confirming a standard Flavian playing-card plan. Few internal buildings have been examined in detail, and the dating relies largely on its strategic context and limited Flavian pottery finds rather than extensive stratigraphic evidence.
Bertha was a Roman auxiliary fort situated at the confluence of the Rivers Tay and Almond, just north of modern Perth. It is recorded in the Pleiades gazetteer of ancient places as a fort site from the Roman period in Britain.
Bertha is classified as a Roman fort — a military site in the Pleiades ancient world gazetteer. Roman Britain's archaeology encompasses thousands of sites ranging from legionary fortresses and marching camps to villas, temples and towns.
Several Roman sites lie within a short distance, including Untitled (8.8 km), Cargill (11.5 km), Victoria? (12.7 km). Aubrey Research maps over 2,200 Roman sites across Britain, drawn from the Pleiades ancient world gazetteer.
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