The site, which dates back to at least 1269 when it was first recorded as the ‘old castle’ of Latteragh, was strategically placed to guard both the river crossing and an important routeway between Nenagh and Thurles. A bridge now spans the river to the northeast, whilst the main road runs along the northern boundary of the site.

The earthwork consists of a substantial flat-topped mound, measuring 34 metres from north to south, with characteristically steep sides that would have made any assault extremely difficult. This central mound is surrounded by a defensive fosse, or ditch, approximately 3.5 metres wide, with an outer bank that once completed the fortification. Unfortunately, road construction has damaged the southern section, removing the bank entirely, whilst the southeastern quadrant shows signs of deliberate levelling; possibly from agricultural activities in more recent centuries.

Historical records indicate that in the early thirteenth century, the Bishop of Killaloe granted the Manor of Latteragh to de Marisco, suggesting this was an important ecclesiastical holding. Today, the site is heavily overgrown and shows evidence of erosion, particularly on the south and southwest slopes where soil slippage has occurred. Several informal pathways have been worn into the mound over the years, though the essential form of this medieval fortification remains clearly visible, a testament to the Anglo-Norman influence on the Irish landscape.