Истрад-Тиви
The "cwmwd" of Gŵyr, within the "Cantref" of Eginog and part of Ystrad Tywi, became part of the Kingdom of Deheubarth – founded by Hywel Dda (c. 920) from the Kingdoms of Dyfed and Seisyllwg. Henry de Beaumont, 1st Earl of Warwick conquered Gŵyr c. 1100, styling himself Lord of Gower. Southern Gower was colonised, and eventually became heavily anglicised. Rhys Gryg – fourth son of Rhys ap Gruffydd (The Lord Rhys) – of Deheubarth occupied the peninsula in 1215, but in 1220 he ceded the area to the English, apparently on the orders of Llywelyn ap Iorwerth. Before becoming a park, the area of "Parc le Breos" had been woodland. Its harvesting was implied on medieval rolls.