Llywelyn ap Seisyll

Abt 980 - 1023  (41 years)

• Name	Llywelyn ap Seisyll
  Born	Abt 980	Rhuddlan, Deheubarth, Flintshire, Wales
  Gender	Male
  Died	Between 1021 and 1023
  Person ID	I13466	Brown Genealogy
  Last Modified	26 Sep 2026

  
  

  Family	Angharad verch Maredydd,   b. Abt 982, Rhuddlan, Deheubarth, Flintshire, Wales ,   d. UNKNOWN
  Children	1. Gruffydd ap Llewelyn,   b. Between 1011 and 1030, Rhuddlan, Deheubarth, Flintshire, Wales ,   d. 5 Aug 1063  (Age 52 years)  [natural]
  Last Modified	26 Sep 2026
  Family ID	F3713	Group Sheet  |  Family Chart

  
  

• Notes

  Llewelyn married Angharad, daughter of Maredydd, Prince of Deheubarth. Upon the death of Maredydd the reign of Deheubarth was disputed. The kingdom of Gwynedd was lost and later regained by Llewelyn, who also later succeeded in capturing Deheubarth.