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Castlewilliam is a late-medieval castle situated in County Down, Northern Ireland. The site lies on bedrock of the Gala Group, a formation of wacke stone laid down during the Telychian period of the Silurian, which provides the underlying geology across this part of Ulster. The monument is protected as a scheduled historic monument under reference 7613 by the Historic Environment Division.
As a late-medieval fortification, Castlewilliam belongs to the period of Irish castle-building that flourished from the 13th century onwards, when both Anglo-Norman settlers and Gaelic Irish lords constructed defensive strongholds across the island. Castles of this era were typically built on locally prominent sites to command approaches and overlook surrounding lands, often in strategic positions relative to water sources and travel routes.
The castle's survival as a protected monument reflects its significance to the history of medieval settlement and lordship in Down, a county that saw considerable fortification during the medieval period. The wacke bedrock beneath the site would have provided suitable stone for construction, a practical advantage in siting medieval fortifications in this region. Today Castlewilliam remains a physical record of late-medieval defensive architecture in Ulster.
Castlewilliam. castle is a scheduled monument protected by Department for Communities NI under reference 7613. View the official record →
Castlewilliam is a late-medieval castle situated in County Down, Northern Ireland. It is designated a Scheduled Ancient Monument by DfC Northern Ireland (NISMR) under reference 7613.
Castlewilliam. castle dates from the late-med period, and is classified as a fortification. It is one of over 32,000 scheduled monuments protected across the UK.
Castlewilliam. castle is a Scheduled Ancient Monument, legally protected by DfC Northern Ireland (NISMR) — the body responsible for designating and safeguarding heritage sites in Ni. The official designation reference is 7613.
Several scheduled monuments lie within 10 km, including Cup-&-ring-marked stone (5.8 km), Portal tomb or cist burial (6.2 km), Ballyalton court cairn. court tomb (6.8 km).
This page is just one thread. A full Aubrey report pulls together 14 strands of Castlewilliam. castle'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.
Castlewilliam. castle stands on Gala Group, bedrock that formed in the Telychian. The rock here is wacke.