Anne Wareham of Veddw House Garden has researched the local history of Devauden.  

Here's a link to an article on her website.

A quote from Mysterious Wales

"Devauden is derived from Ffawydden, meaning beech tree. A battle took place here in 743 A.D. when the Welsh were slaughtered by the Saxon kings Ethelbald of Mercia and Cuthred of Wessex."

More Links

Kelly's Directory of Monmouthshire, 1901