Morfydd ferch Urien (Middle Welsh orthographical variations include Morvydd verch Urien; "Morfydd daughter of Urien") is a figure of Welsh Arthurian legend. She is the daughter of Urien Rheged by Modron, and twin sister to Owain. Morfydd appears in the Welsh Triads and is also referred to in Culhwch and Olwen. The enduring love between her and Cynon son of Clydno, one of Arthur's warriors, is remarked on in several of the Triads, pointing to a now lost popular tradition.
The circumstances of their birth is related in a Welsh folktale:
What once was a dream
Now vanished in me
All that I've mourned
To the memory of thee
The love we once shared
The light that was there
Burned out too quickly
In sorrow and despair
I'm nailed from inside
A heart that still cry
Formed from that day when you died
The sadness will stay
Grief made my way
Into the depths of the dark
(Darker than ever, please...)
Save me...I'm frozen and cold
Tears keep on falling
Like rain from above
Save me...the memories take hold
Please, hear my pleading
“If you could revive for awhile”
Embraced by the pain
My pleasure's in vain
Since you were gone
To heaven now belong
If you could revive
And stay for awhile
Renew what we had