At a glance
Trefignath is a multi-phase Neolithic burial chamber on Holy Island (LL65 2YQ), Holyhead — three chambers built between approximately 4000 and 2500 BCE, one of the oldest monuments in Wales. Free Cadw site, open at all times. Short walk from roadside parking. Combine with Penrhos Feilw standing stones (2 miles) and South Stack (3 miles) for a full Holy Island day.
About Trefignath
Trefignath stands on a low rise on the outskirts of Holyhead, a few hundred metres from the modern town that has grown up around the Irish ferry port. The contrast between the 5,000-year-old megalithic monument and the cranes and ferry terminals visible beyond it encapsulates something important about Anglesey: an island that has been at the intersection of sea routes since prehistory, whose landscape carries the accumulated weight of every era of that connection.
The monument consists of three stone-built chambers arranged in line, with the remains of a covering cairn mound. Archaeological excavation in 1977–78 established that the three chambers were built sequentially, with the eastern chamber the earliest (c.4000 BCE) and the western chamber the latest (c.2500 BCE). This multi-phase construction over 1,500 years means Trefignath is not a single act of building but a monument that accumulated meaning and physical form across many generations — added to, modified, perhaps reinterpreted as the people who used it changed over time.
The chambers contain the remains of cremated human bone — the monument functioned as a collective tomb, with multiple individuals interred in the chambers over its period of use. The Neolithic communities who built Trefignath were farmers and pastoralists who had cleared the woodland of Holy Island and established a settled presence — the monument was an anchor of ancestral authority in the landscape.
Visiting tips
Getting there
From the A5 entering Holyhead, follow signs for Trefignath Burial Chamber (LL65 2YQ). The site is on the edge of Holyhead, accessible from the main road. Small roadside lay-by for parking, with the monument a short walk across the field. The site is signed.
Combining with other Holy Island sites
Penrhos Feilw standing stones (2 miles), South Stack RSPB reserve (3 miles) and South Stack Lighthouse (4 miles) can all be combined into a full Holy Island day. Holyhead town has cafés and a market.
Find it on the map
Frequently asked questions
Trefignath is a Neolithic megalithic tomb on Holy Island (<span lang="cy">Ynys Gybi</span>), Anglesey. Unlike most single-phase burial chambers, Trefignath is unusual in having three distinct chambers built over a period of approximately 1,500 years — from around 4000 BCE (the eastern chamber, one of the oldest monuments in Wales) to approximately 2500 BCE (the western chamber). The progression shows how Neolithic communities modified and extended the monument over generations.
The oldest part of Trefignath — the eastern chamber — dates to approximately 4000 BCE, making it one of the oldest megalithic monuments in Wales and among the earliest in Britain. The monument was built and extended in phases over the following 1,500 years, with the western (latest) chamber dating to approximately 2500 BCE. This multi-phase construction over many generations is unusual and archaeologically significant.
The three chambers are visible above ground — upright standing stones with a capstone and remnants of the cairn mound that once covered the monument. The site was excavated in 1977–78, which revealed the phased construction sequence and human bone fragments from the burials within each chamber. The site is well maintained by Cadw and clearly interpreted on-site.
Holy Island contains a remarkable density of prehistoric monuments for its small size — Trefignath burial chamber, Penrhos Feilw standing stones, and the Cytiau'r Gwyddelod (Irish Huts) settlement. Combined with the broader Anglesey concentration of prehistoric sites (including <span lang="cy">Bryn Celli Ddu</span> and <span lang="cy">Barclodiad y Gawres</span>), the island was evidently a centre of Neolithic and Bronze Age activity, possibly connected to its maritime position on the routes between Ireland and mainland Britain.
Trefignath is on the outskirts of Holyhead on Holy Island. From the A5 entering Holyhead, follow signs for Trefignath or use the postcode LL65 2YQ. A roadside lay-by provides parking, with the monument a short walk across the field. The site is signed from the road.