This tree-covered motte rises approximately 12 metres high, its steep sides climbing to a flat summit about 20 metres across. The mound, measuring 57 metres north to south and 45 metres east to west at its base, is encircled by a broad defensive ditch some 8 metres wide, with an external bank running around most of its perimeter. The small Kill River has been cleverly incorporated into the defences, flowing through the fosse on the southwestern and northwestern sides.

According to historical records, this fortification likely dates to the early 13th century or possibly slightly earlier, when the area formed part of the cantred of Offelan. Following Strongbow’s sub-infeudation of Leinster, this territory was granted to Adam de Hereford, and the motte may have been constructed by him or his descendant John de Hereford. The site includes a slightly raised, sub-rectangular bailey extending northwest from the main mound, measuring 57 metres northeast to southwest and 30 metres northwest to southeast. This bailey area is protected by its own bank, standing about 1.5 metres high and 2 metres wide, with traces of an outer fosse still visible.

By 1540, when an extent was compiled, the motte was described as ‘a small mountain surrounded by a dry ditch’, noting that the capital messuage, or manor house, once stood atop it and that the Court Baron was still held there periodically. Today, a deep depression marks the upper surface of the motte, perhaps indicating where structures once stood. The monument has been recognised for its historical importance and is protected under a preservation order issued in 2007, ensuring this remarkable example of Anglo-Norman military architecture remains for future generations to explore and study.