Gwenllian ferch Owain
- Born: After 1120, Aberffraw Castle, Anglesey, Wales
- Marriage (1): Owain Cyfeilliog ap Gruffydd, Prince of Southern Powys
- Died: 1197, Wales
FamilySearch ID: G589-BDF.
Gwenllian married Owain Cyfeilliog ap Gruffydd, Prince of Southern Powys, son of Gruffydd ap Maredudd and Gwerful ferch Gwrgeneu. (Owain Cyfeilliog ap Gruffydd, Prince of Southern Powys was born in 1125 in Montgomeryshire, Wales, died in 1197 in Abaty Ystrad Marchell, Ystrad Marchell, Powys, Wales and was buried in Welshpool, Powys, Wales.)
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