The Battle of Llwchwr (or Battle of Gower) was fought between Welsh and Norman forces between Loughor and Swansea on New Year's Day 1136.

In 1135–1136 an opportunity arose for the Welsh to recover lands lost to the Marcher lords after Stephen de Blois had displaced his cousin Matilda of England from succeeding her father to the English throne the previous year, sparking the Anarchy in England.

A Welsh army was raised by the lord of Brycheiniog (Brecknockshire), Hywel ap Maredudd, containing men from Brycheiniog as well as men from Northern Gŵyr that despised the Norman rule in Southern Gŵyr. The Normans sallied out expecting to meet a small collection of Welsh raiding bands, however the scale of the Welsh army took them by surprise. The two armies met on the common of Carn Coch. In a violent melee, the Welsh army emerged victorious, the Normans having lost around 500 men.

The victory of the Welsh army inspired more rebellions around Wales including a battle near Kidwelly Castle fought by an army led by Gwenllian, Princess of Deheubarth and the Battle of Crug Mawr.

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[1] – I'R GAD: Welsh Medieval Battlefields Campaign.

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