Succession
Succeeds as Prince of Wales
Role range: 1246-1282
Historical biography archive · Updated 2026-11-03
Llywelyn III Biography and Timeline
Follow Llywelyn III through 31 dated historical records for Wales.
Llywelyn III, historical timeline
A chronological timeline drawn from matching World History Database records.
31Distinct records
1 of 1Page
1246–1282Years on this page
1246
1255
Arrest of Owain
Llywelyn III arrested his brother, Owain
Role range: 1246-1282
Battle of Bryn Derwin
Llywelyn III wins authority over Gwynedd & Wales after the Battle of Bryn Derwin. Llywelyn III defeats his brothers Owain & Dafydd
Role range: 1246-1282
Rule of Gwynedd
Llywelyn III wins authority over Gwynedd & Wales after the Battle of Bryn Derwin
Role range: 1246-1282
Rule of Wales
Llywelyn III wins authority over Gwynedd & Wales after the Battle of Bryn Derwin
Role range: 1246-1282
1258
Peace
Signs a truce with Henry III
Role range: 1246-1282
1260
Peace
Renews his truce with Henry III
Role range: 1246-1282
1267
Peace
Agrees a peace with Edward I which is signed at Shrewsbury
Role range: 1246-1282
Peace
The Peace of Montgomery confirm Llewelyns title as Prince of Wales
Role range: 1246-1282
Rule of Marches
Awarded some of the Marcher lands under the Treaty of Shrewsbury
Role range: 1246-1282
Rule of Wales
Recognized as overlord of Wales by Henry III in the Treaty of Montgomery
Role range: 1246-1282
Siege of Cheshire
Devastates Edward Is Earldom in Cheshire
Role range: 1246-1282
Treaty of Montgomery
Recognized as overlord of Wales by Henry III in the Treaty of Montgomery. Henry III accepts Llywelyns homage as prince of Wales
Role range: 1246-1282
Treaty of Shrewsbury
Recognized as the Prince of Wales & overlord of the Welsh magnates. Keeps many of the conquered Marcher lands
Role range: 1246-1282
1273
Dolforwyn Castle
Constructs Dolforwyn castle on the border overlooking the River Severn
Role range: 1246-1282
1274
Coronation
Refuses to attend the coronation of Edward I
Role range: 1246-1282
1276
Homage
Edward I moves court & invites Llywelyn III to pay homage, Llywelyn III refuses
Role range: 1246-1282
Invasion of Wales
Edward I announces his plans to invade Wales & go against Llewelyn III
Role range: 1246-1282
Arrest of Eleanor de Montfort
Edward I has Eleanor held at Windsor while on her way to marry Llewelyn
Role range: 1246-1282
Homage
Llywelyn III is declared a traitor by Edward I after refusing to pay homage
Role range: 1246-1282
1277
Rule of Gwynedd
Under the Treaty of Aberconwy Llywelyn III retains Gwynedd, west of the Conway
Role range: 1246-1282
Rule of Wales
Under the Treaty of Aberconwy Llywelyn III is stripped of his overlordship of Wales
Role range: 1246-1282
Treaty of Aberconwy
Under the Treaty of Aberconwy Llywelyn III retains Gwynedd, west of the Conway. Llywelyn III is stripped of his overlordship of Wales. Llywelyn III is reduced to his traditional heartland to the west of the River Conwy
Role range: 1246-1282
Battle of Chester
Edward III takes to the field & forces Llywelyn III to sue for peace
Role range: 1246-1282
1278
Marriage
Edward I allows the marriage of Llywelyn III to Eleanor, daughter of Simon de Montfort
Role range: 1246-1282
1282
Siege of Hawarden
Llywelyns brother, Dafydd, attacks Hawarden Castle & sparked off the war of 1282-83
Role range: 1246-1282
Battle of Irfon Bridge
Death of Llywelyn III, during a skirmish with the English at Irfon Bridge
Role range: 1246-1282
Death of Llywelyn III
Death of Llywelyn III, during a skirmish with the English at Irfon Bridge
Role range: 1246-1282
Invasion of Wales
Edward I invades Wales
Role range: 1246-1282
Invasion of Wales
Rejects Edward Is sovereignty over Wales
Role range: 1246-1282
Rule of Wales
With the death of Llewelyn the cause of Welsh independence is lost
Role range: 1246-1282
Records, sources and methodology
These dates and descriptions come from the historical_events database. Exact duplicate records have been collapsed. Names are grouped by the country, Name 2 and Name 1 fields; records with missing Name 2 cannot be reliably assigned to an individual biography. Check the underlying sources before formal citation.