Llywelyn ap Gruffudd
Llywelyn ap Gruffudd (c. 1223 – 11 December 1282), often called Llywelyn the Last, was the Prince of Gwynedd who proclaimed himself Prince of Wales in 1258 and became the last native ruler to hold that title over significant portions of Wales until the English conquest.[1][2]
As grandson of Llywelyn ab Iorwerth, he consolidated power in Gwynedd by defeating his brothers at the Battle of Bryn Derwin in 1255, then expanded his authority by securing allegiances in Powys Fadog, annexing parts of Powys Wenwynwyn, and influencing Deheubarth through loyalists, effectively uniting much of native Wales under his overlordship by the early 1260s.[1][2] His diplomatic maneuvering during England's baronial wars allowed alliance with Simon de Montfort, culminating in the Treaty of Montgomery in 1267, whereby King Henry III formally recognized Llywelyn as Prince of Wales—the only such acknowledgment granted to a native Welsh ruler—and accepted his homage as suzerain over other Welsh princes, in exchange for territorial concessions and payments.[2][3]
Relations with the English crown deteriorated under Edward I, leading to war in 1277; Llywelyn's defeat restricted him to Gwynedd west of the River Conwy via the Treaty of Aberconwy, though he married Eleanor, daughter of Simon de Montfort, in 1278, forging a brief dynastic tie.[1][3] A revolt in 1282 prompted his eastern campaign, where he was killed in an ambush near Builth Wells on 11 December, unrecognized by English forces; his decapitated head was sent to London and displayed, while his brother Dafydd's capture and execution in 1283 sealed the fall of native Welsh independence, with Edward I completing the conquest of Wales.[1][3]