Very little information has survived relating to Ieuan and his poetry.
Ieuan composed five poems to a woman named "Anni Goch" in one of which he accuses how false women have been throughout history.
Recent research has shown that Ieuan Dyfi was brought before a church court, where he admitted adultery with Anni, a married woman.
[citation needed] His poems about Anni provoked Gwerful Mechain to respond with her poem "I Ateb Ieuan Dyfi am gywydd Anni Goch".
This article about a Welsh poet is a stub.