Seisyll ap Dyfnwal was a 12th-century Welsh Lord of Gwent Uwchcoed (Upper Gwent). Seisyll was the son of Dyfnwal ap Caradog ap Ynyr Fychan and his wife...

king of Ceredigion Seisyll ap Rhun (10th century) Seisyll ap Ednywain or Owain, father of King Llywelyn of Gwynedd Seisyll ap Dyfnwal (12th century), a...

other Welsh leaders to their deaths. His principal antagonist was a Seisyll ap Dyfnwal, of Castell Arnallt near Llanover in the valley of the River Usk near...

fortified court house, or llys, of Seisyll ap Dyfnwal, lord of Over Gwent or Gwent Uwchcoed, before it was destroyed after Seisyll and some of his household were...

favour from the family after William's son organised the murder of Seisyll ap Dyfnwal and other Welsh princes at Abergavenny in 1176. There is little subsequent...

control over South Wales. The Marcher lord William de Braose invited Seisyll ap Dyfnwal, lord of Upper Gwent, and an array of other Welsh notables to a feast...

Marches. In 1175, Abergavenny Castle was the site of a massacre of Seisyll ap Dyfnwal and his associates by William de Braose, 4th Lord of Bramber. Reference...

Earl of Hereford and lord of Abergavenny, was killed, reputedly by Seisyll ap Dyfnwal of Castell Arnallt. Without a male heir, Henry Fitzmiles' estate and...

1182 in retaliation for the Abergavenny massacre in which his uncle Seisyll ap Dyfnwal had been slain, he burned down Abergavenny Castle of the Anglo-Norman...

Strathclyde (complete list) – Dyfnwal (died 908×915) Owain ap Dyfnwal (fl. 934) Dyfnwal ab Owain (died 975) Rhydderch ap Dyfnwal (fl. 971), possible King Máel...

was attacked by Hywel ap Iorwerth, the Welsh lord of Caerleon, as part of his retaliation for the murder of Seisyll ap Dyfnwal at Abergavenny Castle on...

Hywel ap Cadell, commonly known as Hywel Dda, which translates to Howel the Good in English, was a Welsh king who ruled the southern Welsh kingdom of Deheubarth...

and 1163 but maybe as late as 1175, believed to have been slain by Seisyll ap Dyfnwal, a Welsh Lord of Upper Gwent, the northern half of the old Welsh Kingdom...

Elisedd ap Gwylog, King (725–c.755) Brochfael ap Elisedd, King (c.755–773) Cadell ap Brochfael, King (773–808) Seisyllwg – Arthen ap Seisyll, King (700–735)...

with Hywel Dda of Deheubarth and Morgan ab Owain of Gwent against Owain ap Dyfnwal, King of Strathclyde that year. Owain was forced to submit to the English...

In 1172 Iorwerth's eldest son Owain and Iorwerth's brother-in-law Seisyll ap Dyfnwal, Lord of Upper Gwent, were attacked by soldiers of the Earl of Gloucester...

summons Seisyll ap Dyfnwal and other Welsh leaders to his seat at Abergavenny Castle under pretence of reconciliation and has them murdered. Cadell ap Gruffydd...

Rhain ap Cadwgan Dyfed 710–730 Brycheiniog 710–720 Awst ap Cadwgan [ru] Brycheiniog 720–735 Dyfnwal ap Arthwyr [br] Seisyllwg 735–770 Rhodri Molwynog ap Idwal...

His father Merfyn Frych ap Gwriad had seized the throne of Gwynedd on the death of the last of the old royal line Hywel ap Rhodri Molwynog, Merfyn was...

fortified court house, or llys, of Seisyll ap Dyfnwal, lord of Over Gwent (Gwent Uwchcoed), before it was destroyed after Seisyll and some of his household were...