Brent Knoll has seen human settlement since at least the Bronze Age, becoming an Iron Age Fort about 2,000BC, which covers an area of . It is defended by a single wall around high and by a single ditch, with an entrance on the eastern side, with a second bank on the north east side. It is surrounded by multiple ramparts (multivallate) following the contours of the hill, however these have been heavily damaged by cattle and quarrying.