Sir Dafydd ap Llewelyn ap Hywel (c. 1380 – 25 October 1415), better known as
Dafydd Gam or
Davy Gam, was a Welsh
medieval nobleman, a prominent opponent of
Owain Glyndwr. He died at the
Battle of Agincourt fighting for
King Henry V, King of England in that victory against the French. The name "Gam" is taken from a
Welsh word for "lame/deformed" (from which 'gammy', as in 'gammy leg', may be derived). Regarded as a traitor ("Crooked David") by some Welshmen, he is regarded as a hero by others; his reputation has waxed and waned with those of his enemy Owain Glyndwr and his ally King Henry V.