Llantrisant Castle

Llantrisant Castle stands in the town of Llantrisant, Wales, and its origins lie within the medieval period. Built during the era when Norman influence spread into Wales, the castle’s foundation is attributed to various possible founders, reflecting different phases of early medieval power in the region. Some traditions name Gwrgan ab Ithel, a local lord of Glamorgan, as an early builder, while others suggest Einion ab Collwyn constructed it following the Norman invasion led by Robert Fitzhamon. Additional accounts propose either Robert Fitzhamon himself or his son, Earl Robert of Caen, as the castle’s founder, indicating its establishment during the 11th or early 12th centuries under Norman Welsh lordship.

During the late 1200s, the fortress came under the ownership of Gilbert de Clare, known as the Red Lord of Glamorgan. Documents from 1297 reveal that the castle was actively maintained, with writs referring to ongoing works such as completing the castle’s main gate. This period marks Llantrisant Castle’s role in local governance and defense, as Gilbert de Clare held significant influence and demonstrated allegiance to King Edward I of England. The castle functioned as a military stronghold and administrative center, managed by appointed custodians including Walter de Hacklut.

In the early 14th century, Llantrisant Castle remained strategically important, though signs of trouble emerged. William Fleming, one of its keepers, was executed for treason, revealing the turbulent political climate surrounding the castle. The site suffered considerable damage during the 1404 rebellion led by Welsh leader Llewellyn Bren, whose uprising involved attacks on several Glamorgan castles. Following this period, the castle’s prominence declined, with records indicating that by the 15th century it became part of the dowry of Thomas, Earl of Gloucester’s widow before coming under Henry V’s control. Over time, Llantrisant Castle fell into disrepair and was abandoned, leaving behind only fragments of its former structure.

Throughout its history, the castle was linked to extensive surrounding lands, notably two large enclosed parks referred to historically as the “gay pigs.” These parks were integral to the castle’s estate, and their legacy endures in local farm names. Though Llantrisant Castle experienced phases of construction, conflict, and eventual ruination, it remains a witness to the shifting control and unrest that shaped medieval Glamorgan.