Penllyn, Vale of Glamorgan, a village and community in the Vale of Glamorgan
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Penllyn a village in Lower Gwynedd Township, Montgomery County, Pennsylvania
One source gives his mother as Tegwedd, daughter of Tegid Foel of Penllyn, a legendary figure who is the mother of Taliesin in the tale of Ceridwen and who is associated with Llyn Tegid (Bala Lake).
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S. Baring-Gould in The Lives of the British Saints (1907) states that he was the son of Cedig ap Ceredig ap Cunedda Wledig, and that his mother was a Saint Tegfedd or Tegwedd, the daughter of Tegid the Bald (Tegid Foel), Lord of Penllyn in Meirionnydd, and that he lived in the early part of the 6th century.