After the battle, he attached himself to the court of Urien, where he "lived bravely, clothed himself sumptuously, did not spare the ale and mead, and was blessed with 24 sons.
When Cynddylan was slain in battle, Llywarch was left friendless and destitute, with nothing but the milk from a single cow to support him.
[4] At this point, a monk associated with Llanfor in Meirionydd, near Bala Lake in Gwynedd, is said to have taken pity on him, converted him, and witnessed his happy death.
[6] His life was the subject of a presumed lost saga of which only the poetry, a series of englynion, survives, known as Canu Llywarch Hen.
The Canu Heledd, concerning the fall of the kings of the Pengwern region, and the elegy Geraint son of Erbin, concerning the Battle of Llongborth, are also associated indirectly with Llywarch.