This impressive earthen mound, with its flat top measuring 36 metres north to south and 27 metres east to west, rises between 4.7 and 6.2 metres above its base. The motte is encircled by a berm and an outer earthen bank, creating a defensive structure that spans roughly 90 metres at its widest point. While the bank may have been modified in the nineteenth century, when the OS maps show the monument covered with trees, the core of the motte dates back to the Norman period.

The strategic importance of Ardmulchan becomes clear through its medieval history. Initially retained by Hugh de Lacy during the sub-infeudation of Meath, the manor was granted to Theobold Walter de Botellier before 1199. Theobold subsequently granted the church and chapels to the Augustinians of St Thomas the Martyr, whilst the temporalities were secured by Bishop de la Corner for Lismullin nunnery around 1240; rights that persisted until the Dissolution. The site’s prosperity is evident from medieval records: by 1212, when administered by William le Petit during royal control of de Lacy properties, Ardmulchan yielded over 23 pounds in rent, making it one of Meath’s most profitable settlements.

The manor’s continued importance through the thirteenth century is illustrated by a rather colourful incident in 1297. When the sheriff attempted to execute a warrant against Geoffrey de Genneville, who had acquired the manor through marriage into the de Lacy family in 1244, the local inhabitants proved so intimidating that the sheriff not only failed in his mission but found himself relieved of his own cattle. Today, the parish church of Ardmulchan sits about 50 metres south of the motte, a reminder of the ecclesiastical connections that ran alongside the site’s military and economic significance throughout the medieval period.