Gaer Hillfort, Trellech

Gaer Hillfort (Welsh: Bryngaer Croes Trelech) is a Celtic Iron Age defended enclosure near Trellech in Monmouthshire, Wales, dating to c. 800 BC - AD 74. Roughly circular at 105 m in diameter, it occupies a south-facing slope with steep drops on the south, east, and west sides, and is surrounded by a bank and ditch. The site offers commanding views to the south and west, suggesting strategic defensive or administrative importance. It is registered by Cadw (SAM: MM077) as one of approximately 600 hillforts identified across Wales.