A ''tynged'' ("doom, fate, destiny", ''plural tynghedau'') is the

Welsh Welsh may refer to: Related to Wales * Welsh, referring or related to Wales * Welsh language, a Brittonic Celtic language spoken in Wales * Welsh people People * Welsh (surname) * Sometimes used as a synonym for the ancient Britons (Celtic peop ...

equivalent of the Irish ''

geis A ' or ' (pl. ') is an idiosyncratic taboo, whether of obligation or prohibition, similar to being under a vow or curse, yet the observance of which can also bring power and blessings. It is also used to mean specifically a spell prohibiting s ...

'', similar to being under a vow, curse or spell. The most famous example is that placed by

Arianrhod Arianrhod () is a figure in Welsh mythology who plays her most important role in the Fourth Branch of the ''Mabinogi''. She is the daughter of Dôn and the sister of Gwydion and Gilfaethwy; the Welsh Triads give her father as Beli Mawr.Triad 35. B ...

on her son

Lleu Llaw Gyffes Lleu Llaw Gyffes (, sometimes spelled Llew Llaw Gyffes) is a hero of Welsh mythology. He appears most prominently in the Fourth Branch of the Mabinogi, the tale of Math fab Mathonwy, which tells the tale of his birth, his marriage, his death, his r ...

in the fourth of the

Four Branches of the Mabinogi The ''Four Branches of the Mabinogi'' or ''Pedair Cainc Y Mabinogi'' are the earliest prose stories in the literature of Britain. Originally written in Wales in Middle Welsh, but widely available in translations, the ''Mabinogi'' is generally agre ...

, the Mabinogi of

Math fab Mathonwy In Welsh mythology, Math fab Mathonwy (), also called Math ap Mathonwy (Math, son of Mathonwy) was a king of Gwynedd who needed to rest his feet in the lap of a virgin unless he was at war, or he would die. The story of Math is the fourth of the ...

References

* Ifans, Dafydd & Rhiannon, ''Y Mabinogion'' (Gomer 1980) Welsh mythology {{Celt-myth-stub