Tangwystl

Tangwystl (also known as Tanglws, Hawystl or Hawystl Gloff) was a Welsh saint of the 5th century, one of the twenty-⁠four daughters of Brychan of Brycheiniog. She married Tydanwedd ap Amlawdd Wledig and lived at Bangor-⁠on-⁠Dee. She was the mother of Saint Marchell of Dyffryn Clwyd and of other saints. She lived at Hafod Tangwystl, now Aberfan, a Christian community that was attacked by enemies, in which everyone was killed, among them Tangwystl and her brother Rhun.

Several churches are dedicated to her, among them Ystrad Tanglws in Glamorgan, perhaps Llangwestyl, and the old chapel of Llan Dydystl in Llandeilo Fawr, Carmarthenshire; she is the saint of Capel Tydyst in Llangadog Fawr. Venerated in the Celtic tradition, with no known synodal canonization.