May 31, 1257
Welsh forces under Meredudd, ap Rhys and Meredudd, ab Owain ambush a force of English and Welsh collaborators
Ireland
Welsh forces under Meredudd ap Rhys and Meredudd ab Owain ambush a force of English soldiers and Welsh collaborators at Pont ar Gothi (modern Pontargothi), in Carmarthenshire. The three-day battle results in a decisive Welsh victory, with approximately 3,000 of the opposing force killed. This event forms part of the broader resistance against Anglo-Norman expansion into Wales during the medieval period.