'''Idwal Foel ap Anarawd ''' (''Idwal Voal'' e brezhoneg), marvet e 942, a oa [[roue Gwynedd]], ha meneget evel [[Roue ar Vrezhoned]] gant [[William of Malmesbury]], en e [[Gesta Regum Anglorum]], skrivet Judwalum er skrid latin orin, saoznekaet goude en Jothwel. En [[Annales Cambriae]] eo skrivet Iudgual.
Idwal inherited the throne of Gwynedd on the death of his father, Anarawd ap Rhodri in 916. He was obliged to acknowledge Athelstan of England as overlord. Following the death of Athelstan, Idwal and his brother Elisedd took to arms against the English, but both were killed in battle in 942. The rule of Gwynedd should now have passed to his sons, Iago ab Idwal and Idwal, usually called Ieuaf ab Idwal. However Hywel Dda, already ruler of most of south Wales, invaded Gwynedd and forced them into exile, adding Gwynedd to his realm. After Hywel's death in 950, Idwal's sons were able to claim the kingdom.