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Latitude: 52.655 / 52°39'18"N
Longitude: -3.323 / 3°19'22"W
OS Eastings: 310600
OS Northings: 307187
OS Grid: SJ106071
Mapcode National: GBR 9S.5SL8
Mapcode Global: WH79L.XJSG
Entry Name: Site 300m SW of Tan-llan (revealed by aerial photography)
Scheduled Date: 10 March 1980
Source ID: 3004
Cadw Legacy ID: MG203
Schedule Class: Defence
Community: Llanfair Caereinion
Built-Up Area: Llanfair Caereinion
Traditional County: Montgomeryshire
The monument consists of the remains of a defended enclosure, which probably dates to the Iron Age period, (c.800BC – AD74, the Roman Conquest of Wales). The site consists of a sub-circular, trivallate enclosure c.200m in diameter with narrow spaced outer ramparts. The innermost enclosure survives as an earthwork, although in a degraded state. The enclosure is set upon a gently sloping plateau above the Afon Banwy.
The monument is of national importance for its potential to enhance our knowledge of later prehistoric defensive organisation and settlement. The site forms an important element in the wider later prehistoric context and within the surrounding landscape.