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Gaer hillfort (Welsh: Bryngaer Croes Trelech) is a Celtic Iron Age hillfort near Trellech in Monmouthshire, Wales (grid reference SO492037).
This fort was registered by Cadw and is identified with the number SAM: MM077. There are approximately 300 hillforts in CADW's list of monuments, although archaeologists believe there were nearly 600 in total.
References
Gaer hillfort, Trellech Wikipedia(Text) CC BY-SA