The castle’s rich history stretches back to the Tudor period, when it was known by various spellings including Zoghesgren, Xoghtesgrene, and attempts to transliterate “Tuath Aesgreine.” The Mac Brien family held these lands and fortifications for generations, with notable figures including Thady Mac Brian, who was granted the manor in 1544 after it was recovered from a gang of robbers known as the “Oolde children.”

Historical surveys from the 1650s paint a vivid picture of the estate during its heyday. The Down Survey noted that Tuogh Killuragh boasted a castle in good repair, a stone house, and six cabins that likely formed a small village. The Civil Survey of 1654-56, which recorded Tadhg O’Brien as the owner, provides even more detail: the lands of Tuogh and Pallisbeg contained not only the main castle but also a bawn (a defensive courtyard wall), a separate stone house, an orchard, two mill seats along the river Glydagh, and the ruins of Pallisbeg Castle. This collection of structures indicates a thriving estate complex that served as both a defensive stronghold and an agricultural centre.

The castle changed hands several times over the centuries, passing from the O’Brien family to Roger, Earl of Orrery, who was confirmed in the Manor of Twagh in 1666. By the 18th century, it had become the residence of the Lloyd family. Today, while the original castle no longer stands, Towerhill House serves as a reminder of this site’s long and varied history, from medieval Irish lordship through English colonisation to its current incarnation as part of Limerick’s architectural heritage.