Gwertyl verch Gwgenas
- Born: Abt 1104, Powys Castle, Welshpool, Montgomeryshire, Wales
- Marriage: Gruffydd ap Maredydd Lord of Cyfeiliog
 Noted events in her life were:
• Web Reference: Charles Cawley's Medieval Lands.
The Chronicle of the Princes of Wales records that "Einon son of Cadwgan son of Bleddyn and Gruffudd son of Maredudd son of Bleddyn joined together to make an attack upon the castle of Uchtryd son of Edwin" in 1113 [Brut y Tywysogion (Williams), p. 141]. Lord of Mawddy. The Annales Cambrić record the death in 1128 of "Grifinus filius Meredut" [Annales Cambrić, p. 38]. The Chronicle of the Princes of Wales records that "Gruffudd son of Maredudd son of Bledyn" died in 1125 [Brut y Tywysogion (Williams), p. 155]. Gryffydd married Gwerfyl, daughter and heiress of Gwrgeno ap Hywel Lord of Caer or Clydewen & his wife.
Gwertyl married Gruffydd ap Maredydd Lord of Cyfeiliog, son of Maredydd ap Bleddyn and Hunydd verch Einudd. (Gruffydd ap Maredydd Lord of Cyfeiliog was born about 1101 in Cyfeiliog, Merionethshire, Wales and died about 1125 in Cyfeiliog, Merionethshire, Wales.)
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