Gruffudd Fychan II was Lord of Glyndyfrdwy and Lord of Cynllaith Owain c.1330–1369. As such, he had a claim to be hereditary Prince of Powys Fadog,[1][2] and was a member of the Royal House of Mathrafal. His son, Owain Glyndwr, started the Welsh Revolt and became Prince of Wales.
- ^ Gower, Jon (2014). The Story of Wales, BBC books, Huw Edwards, Ebury Publishing, Open University, Wales, p. 134
- ^ Henderson, Zoe (2016). Caerfallen, Ruthin, Old Welsh Houses Group, North West Wales Dendrochronology Project, Gill. Jones & Ann Morgan, Wales, p. 10