"In 1118 Hywel ap Ithel made war upon his neighbours, the sons of Owain ap Edwin, who were lords of the cantref of Dyffryn Clwyd. Hywel brought Maredudd ap Bleddyn, with 400 warriors from Powys, to his aid, while Gronw ab Owain and his brethren had the help of Norman knights from the lands of the Earl of Chester. A bloody battle was fought at Maes Maen Cymro, a mile to the north-west of Ruthin, in which Hywel and his forces won the day and Llywarch ab Owain was slain. But Hywel was severely wounded, and his death six weeks later turned the momentary victory into a real defeat.
(Footnote:) Maes Maen Cymro is a township in the parish of Llanynys and lies in the neighbourhood of Rhewl railway station." Source: J.E.Lloyd, A History of Wales, vol II, 1912, p.465-6.
In 1118, Hywel ab Ithel, lord of Rhos and Rhufoniog, and Goronwy, Rhuiddid and Llywarch, the sons of Owain ap Edwin and lords of Dyffryn Clwyd, fought a bitter battle where the sons of Owain and their supporters were defeated. Hywel died of his wounds forty days later.
Thomas Jones, The Chronicle of the Princes, 1955, p.103.
B.A.Malaws, RCAHMW, 29 August 2006.