Llywelyn ap Seisyll
- Born: 960, Rhuddlan, Flintshire, Wales
- Marriage: Angharad ferch Maredudd in 999 in Deheubarth, Wales
- Died: 1022, Deheubarth, Wales aged 62
 General Notes:
Llywelyn ap Seisyll was the King of Deheubarth.
Noted events in his life were:
• Marriage: to Angharad ferch Maredudd, 999, Deheubarth, Wales.
Llywelyn married Angharad ferch Maredudd, daughter of Maredudd ab Owain and Unknown, in 999 in Deheubarth, Wales. (Angharad ferch Maredudd was born in 985 in Llandilo-Fawr, Carmarthenshire, Wales and died in 1030 in Powis, Montgomeryshire, Wales.)
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