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Din Sylwy is a prehistoric hillfort situated on the island of Anglesey in north Wales. The site comprises a substantial univallate earthwork with a single defensive rampart enclosing an interior space, characteristic of Iron Age hill forts constructed across Wales and the wider British Isles. The fort is positioned to command views across the surrounding landscape, a typical strategic consideration in the location of such defensive settlements. As a scheduled ancient monument registered with Cadw under reference AN024, Din Sylwy represents an important archaeological resource for understanding Iron Age settlement patterns and defensive architecture in the north Welsh landscape.
Din Sylwy is a scheduled monument protected by Cadw under reference AN024. View the official record →
Din Sylwy is a prehistoric hillfort situated on the island of Anglesey in north Wales. It is designated a Scheduled Ancient Monument by Cadw under reference AN024.
Din Sylwy dates from the prehistoric period, and is classified as a hillfort. It is one of over 32,000 scheduled monuments protected across the UK.
Din Sylwy 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 AN024.
Several scheduled monuments lie within 10 km, including Beaumaris Town Wall (5.4 km), Beaumaris Castle (5.6 km), Hendrefor Earthwork (6.4 km).
This page is just one thread. A full Aubrey report pulls together 13 strands of Din Sylwy'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.
Din Sylwy stands on Dinantian Rocks (Undifferentiated), bedrock that formed in the Mississippian. The rock here is limestone with subordinate sandstone and argillaceous rocks.