Iorwerth Drwyndwn the broken-nosed ap Owain Gwynedd  24
- Born: 1145
- Marriage: Margaret ferch Madog 
- Died: Abt 1174, Pennant Melangell , in Powys, Wales about age 29
Cause of his death was killed in battle.
Other names for Iorwerth were "the Broken-Nosed" and the Broken-Nosed.
AKA "the Broken-Nosed"
Iorwerth was killed in battle at Pennant Melangell , in Powys , during the wars deciding the succession following the death of his father.
Iorwerth married Margaret ferch Madog  [MRIN: 2393], daughter of Madog ap Maredudd Prince of Powys  and Susanna of Gwynedd .