Pen Dinas is one of many hillforts in the locality; Bow Street village and Hen Gaer hillfort 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 hillforts from the Welsh Marches to the east and in contrast to some other Welsh hillforts. This may indicate that Pen Dinas was constructed by people moving into this area from the east at around 300 BC (Stanford, 1972).