He died at the Battle of Orewin Bridge.
He engaged in a dispute with Gilbert 'the Red' de Clare over building a castle in Glamorgan, and was troubled by Roger Mortimer's support of Humphrey de Bohun. He massacred the troops of Luke de Tany at Moel-y-don. Pirates were hired to intercept Eleanor de Montfort en route to her marriage with this man, prompting his signing of the Treaty of Aberconwy, after he signed the Treaty of Pipton with Simon de Montfort.The Battle of Cadfan saw Stephen Bayzan defeated by this man's ally Maredudd, and he was recognized as prince of his lands in the Treaty of Montgomery. He died at the Battle of Orewin Bridge. Early in life, at the Battle of Bryn Derwin, he defeated his brothers Owain and Dafydd, the latter of whom succeeded him. Edward I stripped this man's home of Gywnned of all royal insignia. For 10 points, name this last prince of an independent Wales.
He engaged in a dispute with Gilbert 'the Red' de Clare over building a castle in Glamorgan, and was troubled by Roger Mortimer's support of Humphrey de Bohun.
Llewelyn ap Gruffyd [or Llywelyn Ein Llyw Olaf; or Llywelyn III of Gwynedd; or Llywelyn II of Wales]