Built in 1192 by the Anglo-Normans of Leinster during their campaign against the Irish king Donall O'Brien, this fortification didn't remain in English hands for long. Just four years later, in 1196, Donall More MacCarthy of Desmond struck back, destroying the castle, killing many of its defenders, and taking two English chieftains as prisoners; a dramatic reversal recorded in the Annals of Innisfallen.

The motte itself is a substantial earthwork, rising over 12 metres high with a summit platform measuring roughly 15 metres north to south and 10 metres east to west. Stone walling still survives along the causeway that once connected the motte to its northern bailey, including a well-preserved section that stands over 2 metres tall and tapers from 1.8 metres thick at its base to just 70 centimetres at the top. The bailey, an irregularly shaped defensive enclosure measuring approximately 25 by 34 metres, would have housed the garrison and support buildings, though modern excavations have altered parts of its original form.

By 1640, according to the Civil Survey, the site belonged to the Countess of Ormond, but the castle atop the motte was already described as "irreparable" and broken. Today, while briars and thorn trees have claimed much of the steep slopes, and a concrete trigonometric point marks the summit's northwest corner, the essential form of this 830-year-old fortification remains remarkably intact. Protected as a national monument since 1939, Kilfeakle's motte stands as one of Ireland's more impressive examples of Anglo-Norman military architecture, bearing witness to the violent struggles that shaped medieval Ireland.