Lleu Llaw Gyffes (, sometimes misspelled 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 resurrection and his accession to the throne of
Gwynedd. He is a warrior and magician, invariably associated with his uncle
Gwydion.