The castle, which local historian J. O’Donovan suggested in the 1830s belonged to the O’Flanagan clan, changed hands multiple times during the chaotic 16th century. By 1596, it had been lost by Turlough O’Brien to Irish rebels, marking yet another shift in the complex web of alliances and conflicts that characterised the period. The site appears on the Strafford map of Ballintober barony from around 1636, and by 1641, the 54 acres at Leitrim had become the subject of a dispute between Donnagh Mc Kega, Henry Dodwell, and Elinor Connor.

Today, what remains of the castle is an oval, grass-covered mound of earth and stone, measuring roughly 11 metres east to west and 9 metres north to south, rising about 2 metres high. This mound sits at the northeast corner of what was likely a bawn; a rectangular defensive enclosure roughly 30 metres square, now traced only by grass-covered wall footings and scattered stones along its northern and western sides. At the northwest corner, the foundations of a small structure, possibly a corner tower, can still be seen, complete with a narrow entrance on its north side.

The site preserves more than just military architecture. South of the castle mound lie the foundations of a rectangular house, its stone footings still visible, measuring about 9.3 by 5.3 metres internally with an entrance on the eastern side. Just to the west, parts of another house’s northern and eastern walls hint at what was once a small settlement clustered around the castle. These domestic structures, combined with the defensive elements, paint a picture of a fortified residence that served as both a military stronghold and a centre of daily life in medieval Roscommon.