Dún Aonghasa

Dún Aonghasa is the best-known of several prehistoric hill forts on the Aran Islands of County Galway, Ireland. It lies on Inis Mór, at the edge of a 100-metre-high cliff.

It is not known exactly when Dún Aonghasa was built, though it is now thought that most of the structures date from the Bronze Age and Iron Age. T. F. O'Rahilly surmised in what is known as O'Rahilly's historical model that it was built in the 2nd century BC by the Builg following the Laginian conquest of Connacht. Excavations at the site indicate that the first construction goes back to 1100 BC, when rubble was piled against large upright stones to form the first enclosure. Around 500 BC, the triple wall defenses were probably constructed along the fort's western side.

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