Pen Dinas is the name of a hill just south of Aberystwyth on the coast of Ceredigion, Wales and the name of the extensive Iron Age hill fort situated on it. The southern summit is also where in the Bronze Age a burial mound was erected.

The hill fort actually consists of two separate forts built many years apart, which were later combined to form a larger structure. The first fort to be constructed was on the lower northern summit. It consists of an outer ditch and inner rampart of rubble. It would originally have been surmounted by a wooden palisade. The main gateway is on the western side and is formed by a stone lined gap in the ditch and bank.

After this first fort was eventually abandoned several decades passed before work began on a new fortification on the higher summit to the south. This second site is better protected by a steeper slope on the western side. To the south and east huge terraced earth works were built faced with shale which would again have been topped with a wooden palisade. Entrance into the southern fort is via gateways to the north and south. They are both formed of narrow passageways through the earthworks and would also have had timber bridges to cross the ditches. The northern gateway is kinked to the left, probably to aid defence by slowing down attackers.

Eventually the southern fort too became derelict and there is evidence that some of the wooden structures by the northern gateway were burnt. This could be following a hostile raid on the fort or because lack of resources lead to its abandonment. However sometime later the defences of the southern fort were rebuilt this time to a different layout.

The final phase in the forts construction was the refortification of the northern fort and the construction of banks and ditches to connect the two forts together and enclosed the entire hill top. The coming of the Romans to the area in about 74 AD may have led to the forcible abandonment of the fort or it may have fallen from use before then but the only evidence from the Roman period is a early 4th century coin possibly left as an offering to a shrine on the hill.

Pen Dinas is one of many hill forts in the locality; Bow Street lies 4 miles to the north; Goginan 6 miles to the east and Llanilar 4 miles to the south. However there are many features of this fort that are in common with hill forts from the Welsh Marches to the east and in contrast to some other Welsh hill forts. This may indicate that Pen Dinas was constructed by people moving into this area from the east at around 300 BC (Stanford, 1972).

Finds from Pen Dinas are sparse. The only excavations as yet made are those directed by Professor Daryll Forde between 1933 and 1937, which found fragments of a pottery vessel of a type dating to about 100 BC, also beads, loom weights and fragments of corroded iron and bronze.

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