Iago ap Idwal was a notable figure in Welsh history, known for being a king of Gwynedd during the 10th century. He was a member of the royal lineage, specifically the House of Aberffraw, which played a significant role in the governance of Wales. His reign is often associated with the struggles for power among Welsh kingdoms during this period. Iago's rule was marked by conflicts with rival factions, including the Kingdom of Mercia and other Welsh leaders. He is often remembered for his efforts to maintain the independence of Gwynedd and for his involvement in the complex political landscape of medieval Wales.