Kings and their demesnes · Deheubarth · as at first light, 1 January 1200

Gruffydd ap Rhys

The Lord Rhys's chosen heir.

His brother Maelgwn, with Gwenwynwyn's men, seized him at Aberystwyth in 1197 and he spent a year in English hands at Corfe. Released in 1198, he won back all Ceredigion except the castles of Cardigan and Ystrad Meurig, and in 1199 took Cilgerran. On 1 January 1200 he holds the heart of Deheubarth, Dinefwr and Cantref Mawr, most of Ceredigion and Cilgerran, but Cardigan is now the king's, sold to John by Maelgwn.

Who he is

Name
Gruffydd ap Rhys (II)
Title
Prince of South Wales, the Lord Rhys's designated heir
Since
28 April 1197 (his father's death); recognised after meeting Archbishop Hubert Walter
Born
Not pinned (about 1160s)
Family
Eldest legitimate son of the Lord Rhys (Rhys ap Gruffydd) and Gwenllian daughter of Madog ap Maredudd. Married since 1189 to Maud (Matilda) de Braose, daughter of William de Braose; sons Rhys (Rhys Ieuanc) and Owain, both boys.
Confidence
high

Wikipedia (Gruffydd ap Rhys II); Lloyd.

Overlord

None in practice; recognised by Hubert Walter as justiciar in 1197

What it holds

  • Dinefwr, the chief seat of Deheubarth, and Cantref Mawr north of the Tywi
  • Most of Ceredigion (contested with Maelgwn, who holds Ystrad Meurig and John's grant)
  • Cilgerran castle on the Teifi, taken in 1199
  • Emlyn (not pinned)
  • Patronage of Strata Florida and Talley

How it was acquired

Inheritance (1197), recovered by war 1198-99.

Allies and rivals

Rival: Maelgwn ap Rhys, backed by Gwenwynwyn and King John. Ally: Rhys Gryg. Father-in-law: William de Braose.

How things stand that morning

The leading prince of the south, but his brother Maelgwn holds Ystrad Meurig and the king holds Cardigan; the Tywi valley below Dinefwr is a raiding march against the royal castle of Carmarthen.

Wealth

Cattle of Cantref Mawr, the lowland townships of Ceredigion, the abbeys' wool; the loss of Cardigan cost him the Teifi port.

Military

The teulu of Deheubarth and the levy of Ystrad Tywi and Ceredigion; castles of Dinefwr, Cilgerran and the Ceredigion mottes.

Threats

  • Maelgwn with John's backing
  • The royal garrisons of Cardigan and Carmarthen
  • William Marshal, earl of Pembroke, who claims Cilgerran

What the year holds

What happened next, if nothing in play changes it. Each event carries what it depends on and what would stop it.

  1. July 1201His brother Maredudd is killed in Carnwyllion; Gruffydd takes Llandovery and Cantref Bychan.Depends on: Maredudd's death Stopped by: Maredudd surviving
  2. 25 July 1201Gruffydd dies of illness and is buried at Strata Florida; Maelgwn seizes Cilgerran and presses on his nephews.Depends on: Natural death Stopped by: Play that changes his health

Places of note

  • Dinefwr: Chief castle and llys of Deheubarth
  • Cilgerran: Castle on the Teifi, taken 1199
  • Strata Florida: Abbey of the Lord Rhys's house

Where the sources disagree

Evidence: Brut and Wikipedia give years and the Corfe captivity; the share of Ceredigion each brother held in winter 1199-1200 is not pinned.

On the map: Ceredigion is drawn whole as contested; the real split was by commotes and castles.

Primary sources for Deheubarth

Chronicles, registers, sagas and inscriptions written in or near 1200 that cover this entry. Each has its own page with editions, translations and where to read it.

Sources and studies

  1. Wikipedia: Gruffydd ap Rhys II
  2. Wikipedia: Maelgwn ap Rhys
  3. Brut y Tywysogion (Chronicle of the Princes), as cited in the Wikipedia and DWB articles

Last revised 4 November 2026. Published 4 November 2026. Suggest a correction on the OMNIA Discord.