Parc le Breos was a great medieval deer park in the south of the Gower Peninsula, about eight miles (13 km) west of Swansea, Wales, and about 1 1⁄4 miles (2 km) north of the Bristol Channel. The park was an enclosed, oval area of 6.7 miles (10.8 km) in circumference, covering about 2,000 acres (810 ha) and measuring 2 ½ miles (east – west) by just over 1 ¾ miles (4.1 km by 2.9 km). Parc le Breos was established in the 1220s CE by John de Braose (of the powerful Cambro-Norman de Braose dynasty), Marcher Lord of Gower and husband to Margaret Ferch Llywelyn, Llywelyn Fawr’s daughter. Other than for deer husbandry, the park received an income from agistment, pannage, and from sales of wild honey, ferns and dead wood. There is evidence of rabbit warrening in the park. Whether the warrens were free or domestic is unknown.
The park’s boundary was originally marked by a wooden fence, or pale, on the top of an earth bank inside a ditch. Some parts of the pale survive.
Prehistoric finds and an Iron Age enclosure (above Parkmill) show the area of Parc le Breos to have been settled by modern humans since the earliest times.