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The Senacus Stone is an early medieval inscribed stone formerly located in Tudweiliog, within the Dwyfor area of Wales. The stone bears an inscription in the Latin alphabet, characteristic of post-Roman Christian monuments erected across Wales and the broader Celtic world between the fifth and seventh centuries. Such stones commonly marked significant burials, territorial boundaries or religious sites, and served as durable records of personal commemoration when written records were few.
The monument rests upon geological foundations of mafic igneous rock, part of an unnamed intrusion of Ordovician to Silurian age. This dark, dense bedrock, formed during the Silurian period when intense volcanic activity shaped north Wales, provides a stable base in a landscape of ancient geological complexity.
The stone is protected by Cadw, the Welsh heritage organisation, under the reference CN089. Early medieval inscribed stones of this type remain among the most direct surviving evidence of early Christian Wales and the continuation of Roman administrative and commemorative traditions into the post-Roman period. The Senacus Stone contributes significantly to understanding settlement patterns, personal names and religious practice in early medieval Dwyfor.
The Senacus Stone (formerly in Tudweiliog, Dwyfor) is a scheduled monument protected by Cadw under reference CN089. View the official record →
The Senacus Stone is an early medieval inscribed stone formerly located in Tudweiliog, within the Dwyfor area of Wales. It is designated a Scheduled Ancient Monument by Cadw under reference CN089.
The Senacus Stone (formerly in Tudweiliog, Dwyfor) dates from the early medieval period, and is classified as a inscribed stone. It is one of over 32,000 scheduled monuments protected across the UK.
The Senacus Stone (formerly in Tudweiliog, Dwyfor) is a Scheduled Ancient Monument, legally protected by Cadw — the body responsible for designating and safeguarding heritage sites in Wales. The official designation reference is CN089.
Several scheduled monuments lie within 10 km, including The Veracius Stone (formerly in Tudweiliog, Dwyfor) (0 km), Capel Anelog (2 km), Castell Odo (2.5 km).
This page is just one thread. A full Aubrey report pulls together 13 strands of The Senacus Stone (formerly in Tudweiliog, Dwyfor)'s history, each drawn from the record and mapped to the exact spot:
Every location is different. Not every section appears for every place, only what the historical record actually holds turns up in a report.
The Senacus Stone (formerly in Tudweiliog, Dwyfor) stands on Unnamed Igneous Intrusion, Ordovician To Silurian, bedrock that formed in the Silurian. The rock here is mafic igneous-rock.