The Iron Age hillfort of Castell Mawr

Castell Mawr is a historical site located near Eglwyswrw. It is one of several Castell Mawr in Cymru and is believed to date from the Iron Age.

As a small, round fort, Castell Mawr is an example of a class of smaller forts believed to have served as family defenses. The shape of the fort is similar to a class of forts in a region that had a close connection to Dyfed during the Celtic period.

Forts were often built on hills to give defenders a military advantage. While Tre'r Ceiri is a large hillfort in the north-west of Europe, Bryngaer Llanymynech is the largest in terms of area with 57 hectares. These sites served as homes and military barracks before the Roman invasion; many were later reused, such as Dinorben in the north of Cymru. The period of the hillforts in Britain was between 200 BC and AD 43.

Sources: Wikipedia, OpenStreetMap, Wikidata, Wikimedia Commons