This medieval earthwork consists of a raised circular platform measuring 27 metres across, originally defended by an earth and stone bank that’s now mostly worn down to a sloping scarp. The bank, roughly 2 metres wide, rises about 2.5 metres on its outer face, though time has reduced much of its impressive bulk. On the eastern side, you can still make out traces of the defensive ditch, about 3.5 metres wide and half a metre deep, along with remnants of an outer bank that would have provided an additional line of defence.

A 6-metre gap in the inner bank on the southeast side likely marks the original entrance to this fortified site. The interior reveals intriguing evidence of past occupation; the foundations of what appears to be a rectangular building, measuring 11 by 4 metres, can be traced at the centre of the enclosure. These stone footings break through the grassy surface, offering tangible evidence of the structure that once stood here. Additional wall foundations sit atop the eroded bank itself, suggesting the site saw multiple phases of construction or modification during its active use.

This type of earthwork castle, known as a ringwork, represents an important piece of Norman military architecture in Ireland. Unlike the more famous stone castles that came later, these earth and timber fortifications were quick to build and served as administrative centres and defensive strongholds during the early stages of the Anglo-Norman colonisation in the 12th and 13th centuries. The Lisduff example, recorded in detail during the Archaeological Survey of North Tipperary, provides valuable insight into how these frontier settlements were organised and defended in medieval Ireland.