This fortified site, measuring approximately 45 metres northeast to southwest and 55 metres northwest to southeast, is defined by a prominent scarp and an external defensive ditch, with its original entrance still visible on the north-northeast side. The earthwork appears on historical Ordnance Survey maps, including William Eyre’s 1752 coloured draught of the Limerick countryside, which shows the castle in roughly the same location where these traces remain today.

The castle’s documented history reveals it was once part of a thriving estate owned by the Arthur family. The Civil Survey of 1654-56 records that Thomas Arthur, an alderman of Limerick, held “a ruinous castle, an orchard, and a water corn mill” at Reboge, suggesting the site was already in decline by the mid-17th century. Earlier records from 1633 mention Nicholas Arthur holding “Rebucke Castle,” whilst various inquisitions trace the property through different members of the Arthur family throughout the early 1600s. The 1657 Down Survey map provides a fascinating glimpse of the castle’s original appearance, depicting it as a tall tower house with a lower two-storey hall or domestic building extending from its southeast face; a typical arrangement for Irish tower houses of the period.

Today, whilst no standing masonry survives above ground, the earthwork boundaries clearly define where this once-important stronghold stood. The site’s proximity to water resources, evidenced by both the historical corn mill and the later waterworks reservoir, highlights its strategic importance through different eras. These earthen remains, though modest compared to the tower house that once stood here, preserve the footprint of a castle that played its part in the complex tapestry of Limerick’s medieval and early modern history.