|Patronage||Morwenstow, Cornwall, England|
She was trained in Ireland before crossing over to Cornwall. Morwenna made her home in a little hermitage at Hennacliff (the Raven’s Crag), afterwards called Morwenstow (meaning "Morwenna's holy-place"). It stands near the top of a high cliff overlooking the Atlantic Ocean, where the sea is almost constantly stormy, and from where, in certain atmospheric conditions, the coast of Wales can be seen. She built a church there, for the local people, with her own hands. It is said that she carried the stone on her head from beneath the cliff and where she once stopped for a rest, a spring gushed forth to the west of the church. 
Early in the sixth century, while she lay dying, her brother, St. Nectan, came to see her, and she asked him to raise her up so that she might look once more on her native shore. She was buried at the church in Morwenstow.
A painting was later found on the north wall of the Morwenstow church, thought to represent St. Morwenna. It shows a gaunt female clasping a scroll to her breast with her left hand; the right arm is raised in blessing over a kneeling monk.
A local saint, she is depicted in a stained glass window of the parish church, St Morwenna and St John the Baptist's (Saint John was added as a dedication c. 1275 when the church was given to St John the Baptist's hospital in Bridgwater).
According to Nicholas Orme, a well in the parish (at ) is nowadays associated with her; to the west of the church,' halfway down a precipice' is now alas dry. The Holy Well of St. Morwenna is an English Heritage listed building.
- Baring-Gould, Sabine (1914), The Lives of the Saints, J. Grant, p. 263.
- Orme, Nicholas (2000). The Saints of Cornwall, p. 196, at Google Books, Oxford University Press, p. 196.
- "St. Morwenna of Morwenstow, Cornwall", Antiochian Orthodox Christian Church
- "Morwenstow". iWalk North Cornwall. Retrieved 20 January 2013.
- Ford, David Nash. "EBK: St. Morwenna". Nash Ford Publishing. Retrieved 18 January 2013.
- "Curious Morwenstow", BBC Domesday Reloaded
- "Holy Well of Sat. Morwenna", British Listed Buildings