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Sully Island "Danish" Fort is a prehistoric hillfork located on Sully Island in the Vale of Glamorgan, Wales. The site comprises a defensive enclosure defined by substantial earthwork banks and ditches, though its precise dating and chronological assignment remain matters of scholarly discussion. The popular designation as a "Danish" fort reflects historical interpretation rather than confirmed Viking-period occupation, and the monument is now understood more broadly as a prehistoric fortified settlement. The site represents an important example of Iron Age or earlier defensive architecture in the Vale of Glamorgan, though full archaeological investigation would be required to establish its exact chronological phase and functional significance.
Sully Island, "Danish" Fort is a scheduled monument protected by Cadw under reference GM035. View the official record →
Sully Island "Danish" Fort is a prehistoric hillfork located on Sully Island in the Vale of Glamorgan, Wales. It is designated a Scheduled Ancient Monument by Cadw under reference GM035.
Sully Island, "Danish" Fort dates from the prehistoric period, and is classified as a hillfort. It is one of over 32,000 scheduled monuments protected across Britain.
Sully Island, "Danish" Fort is a Scheduled Ancient Monument, legally protected by Cadw — the body responsible for designating and safeguarding heritage sites in Wales. The official designation reference is GM035.
Several scheduled monuments lie within 10 km, including St Mary's Well Bay Pillbox (0.8 km), Anti-aircraft and Coastal Battery West of Lavernock Point (1.2 km), Middleton Moated Site (2.5 km).
Aubrey generates in-depth historical research for any address in Britain — drawing on scheduled monument data, Domesday records, Roman heritage, PAS finds and medieval history to reveal the complete story of a landscape.
Research the area around Sully Island, "Danish" Fort