Llywelyn ab Iorwerth “the Great”, King of Wales ★

Born 1173, at Tomen Castell, Dolwyddelan. He married 1205, to Joan, Lady of Wales. He died April 11, 1240, at Aberconwy Abbey.

Early Years and Rise to Power (1173–1199)

Llywelyn ab Iorwerth was born in 1173 at Dolwyddelan in the Nantconwy valley. His father, Iorwerth Drwyndwn, died while Llywelyn was still an infant, leaving him without direct protection as Gwynedd fractured into rival claims among his uncles, Dafydd ab Owain and Rhodri ab Owain. According to the chronicler Gerald of Wales, Llywelyn began asserting his own claims to power at only about twelve years old, despite his uncles' far greater wealth and English backing.

In 1194 Llywelyn allied with his cousins to defeat his uncle Dafydd at the Battle of Aberconwy, and by 1197 he had captured and imprisoned Dafydd outright, holding him until Church pressure forced his release. On Epiphany 1199 he captured the strategic castle of Mold and defeated his remaining cousins in Arfon, driving them from the core territory of Gwynedd; the following day he issued a charter styling himself "prince of the whole of North Wales," completing his rise to supreme authority in Gwynedd at about twenty-six.

Consolidation and Treaty-Making (1200–1209)

Having secured Gwynedd, Llywelyn turned to formal relations with the English Crown, concluding a treaty with King John in July 1201 — the earliest surviving written agreement between an English king and a Welsh ruler — under which Llywelyn did homage in exchange for recognition of his conquests and the right to have disputes judged under Welsh law.

In 1205 he married Joan, King John's natural daughter, a match that both elevated his standing and bound him closely to the English crown; Joan would prove a capable political figure in her own right, repeatedly interceding with her father on her husband's behalf. When John fell out with the prince of Powys and arrested him in 1208, Llywelyn seized the opening to annex southern Powys and northern Ceredigion, and the following summer he even joined John on a campaign against William the Lion of Scotland as a trusted royal ally.

Crisis and Recovery: The Conflict with King John (1210–1217)

The alliance collapsed in 1210, and in 1211 King John invaded Gwynedd with the support of nearly every other Welsh prince, penetrating deep into Snowdonia and burning Bangor. Facing defeat, Llywelyn sought terms through Joan's direct appeal to her father, but the price was steep: he lost all lands east of the Conwy, paid heavy tribute, and surrendered hostages including his own son.

The recovery that followed was remarkably swift. Welsh princes who had backed John grew disillusioned and returned to Llywelyn's side, and Pope Innocent III — then feuding with John over Church matters — released the Welsh rulers from their oaths to the English king. Within two months of 1212 Llywelyn had recovered nearly all of Gwynedd, and by 1213 he held the last English-controlled castles too. He went on to ally with rebellious English barons and the King of France, capturing Shrewsbury in 1215 the same year Magna Carta was signed, and by the end of that year commanded a pan-Welsh army that took the major southern castles of Carmarthen, Kidwelly, Llanstephan, Cardigan, and Cilgerran.

Dominance and Vassalage (1216–1234)

At a council at Aberdyfi in 1216 Llywelyn adjudicated disputes among the lesser Welsh princes, who formally swore him allegiance — the moment historians mark as his transformation from military ally to feudal overlord of Wales. Following King John's death that year he formalized this dominance in the 1218 Treaty of Worcester with the new king, Henry III, which confirmed his conquests and secured his position as the dominant power in Wales for the rest of his reign.

Over the following fifteen years he balanced periodic warfare against the Marcher lords and the Crown with strategic marriage alliances, marrying his daughters into the great Anglo-Norman families of de Braose, Mortimer, and the Earls of Chester. He also built the first sophisticated stone castles in native Welsh hands — including Criccieth, Dolbadarn, Dolwyddelan, and Castell y Bere — and fostered small urban settlements as centers of trade and authority, campaigns against Hubert de Burgh, the Marshal earls, and the Crown continuing intermittently through the 1220s.

Marital Crisis and Title Change (1230)

In 1230 William de Braose, a captive Llywelyn had ransomed and then allied with through a planned marriage, was discovered in the prince's own chamber with his wife Joan; Llywelyn had him hanged, and Joan was placed under house arrest for a year before being forgiven and restored to her position — the planned marriage between their children going ahead regardless, securing the de Braose lands in south Wales for Llywelyn's heir.

That same year Llywelyn changed his style from "Prince of North Wales" to "Prince of Aberffraw and Lord of Snowdon," invoking Aberffraw's status as the ancient seat of Gwynedd's rulers. Despite his authority over the rest of Wales, he never claimed the title "Prince of Wales" outright, preferring the substance of power to a title that might provoke unnecessary English opposition.

Succession Planning (1220–1238)

Much of Llywelyn's later energy went into securing the succession for his legitimate son Dafydd over his elder, illegitimate son Gruffudd, whom Welsh custom would otherwise have treated as an equal heir. He petitioned the Pope in 1222 to confirm Dafydd's succession under church law, secured papal recognition of Joan's own legitimacy in 1226 to strengthen the claim further, and won English acceptance of Dafydd's homage in 1229.

Gruffudd himself was managed rather than disinherited outright — given lands, stripped of them when his rule proved harsh, imprisoned between 1228 and 1234, then granted territory again once his conduct improved. In 1238 Llywelyn convened a council at Strata Florida Abbey where the other Welsh princes swore fealty to Dafydd, though King Henry III blocked the more binding homage Llywelyn had originally wanted them to perform.

Final Years and Death

Joan died in 1237, and Llywelyn suffered a paralytic stroke the same year that ended his active rule; Dafydd took over governing in practice, going so far as to imprison his half-brother Gruffudd to secure his own succession. Llywelyn spent his last years at Aberconwy Abbey, the Cistercian house he had founded, and died there on April 11, 1240, at about sixty-seven, after more than forty years as ruler of Gwynedd.

His dominance did not fully pass to his heir: Henry III refused to let Dafydd inherit authority over the other Welsh princes, and the kingdom Llywelyn had built began to fracture again within a generation. He is remembered as the greatest of the medieval Welsh princes, and his stone coffin survives today in St Grwst's Church in Llanrwst.