He is sometimes credited with killing Edward, Duke of York, wounding Humphrey, Duke of Gloucester, and cutting an ornament from the crown of Henry V of England; but he was then overpowered by the King's bodyguard, and slain by the Welsh nobleman Dafydd Gam before he could yield himself.
Dafydd Iwan | Dafydd ap Gwilym | Llywelyn ap Dafydd | Gwladys ferch Dafydd Gam | David Pugh and Dafydd Rogers | Dafydd Williams | Dafydd Wigley | Dafydd Goch | Dafydd Gam | Dafydd Elis-Thomas | Dafydd Davis | Dafydd ab Owain Gwynedd | Dafydd ab Hugh | Dafydd ab Edmwnd |
Roger, his father-in-law Dafydd Gam and his recently married son, Roger, had been part of the Welsh contingent that fought with Henry V of England, popularly designated Harry of Monmouth, at the Battle of Agincourt on 25 October 1415.