This medieval stronghold appears as a substantial structure on historical Ordnance Survey maps from 1837 and 1914, where it’s marked as a large building measuring roughly 20 metres east to west and 15 metres north to south. The site sits on low ground just 60 metres northeast of the West-East Lung River, a strategic position that would have offered both defensive advantages and access to water.

Today, nothing of the castle remains visible above ground; the pasture has reclaimed what was once a symbol of Norman-Irish power in the region. The Costellos, or Mac Costello as they were known in Irish, were a prominent family who controlled significant territories in Connacht during the medieval period. They were descended from the de Angulo family, Anglo-Norman settlers who arrived in Ireland during the 12th century and gradually adopted Irish customs and language.

Archaeological investigations have attempted to uncover more about this lost fortress, though with limited success. Testing conducted in 2005 approximately 100 metres northeast of the site yielded no related materials, and further excavations in 2014 immediately to the south proved similarly fruitless. Despite the lack of physical evidence, the castle’s presence on detailed 19th and early 20th century maps confirms its existence and importance to the local landscape, serving as a reminder of the complex layers of history that lie beneath Ireland’s seemingly tranquil countryside.