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Y Tomen Fawr (Domen Seba) is a motte, or mounded earthwork fortification, located in Carmarthenshire and dating to the Norman period following the conquest of Wales in the late eleventh and twelfth centuries. The monument consists of a substantial artificial mound typical of early Norman defensive architecture, designed to support a timber or stone palisade and keep structure. Such mottes served as focal points of Norman administrative and military control across Wales during the initial phases of conquest and settlement. The site remains an important example of early medieval fortification strategy in South Wales, reflecting the pattern of Norman expansion into the region during this transformative period of Welsh history.
Domen Seba (or Y Tomen Fawr) Castle Mound is a scheduled monument protected by Cadw under reference CM020. View the official record →
Y Tomen Fawr (Domen Seba) is a motte, or mounded earthwork fortification, located in Carmarthenshire and dating to the Norman period following the conquest of Wales in the late eleventh and twelfth centuries. It is designated a Scheduled Ancient Monument by Cadw under reference CM020.
Domen Seba (or Y Tomen Fawr) Castle Mound dates from the medieval period, and is classified as a motte. It is one of over 32,000 scheduled monuments protected across the UK.
Domen Seba (or Y Tomen Fawr) Castle Mound 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 CM020.
Several scheduled monuments lie within 10 km, including Nant-Gronw Round Barrows (5.6 km), Crug Ieuan Round Barrow (5.9 km), Garreg Wen Standing Stone (6 km).
Aubrey generates in-depth historical research for any address in the UK — drawing on scheduled monument data, Domesday records, Roman heritage, PAS finds and medieval history to reveal the complete story of a landscape.
Research the area around Domen Seba (or Y Tomen Fawr) Castle Mound