His father , Iorwerth ab Adda , is buried at nearby Valle Crucis Abbey .
The famous bridge across the River Dee at Llangollen , Denbighshire is reputed to have been built in about 1345 by John Trevor , who was then living at nearby Trefor Hall .
John Trevor 's father , Iorwerth ab Adda , is buried at nearby Valle Crucis Abbey .
The famous bridge across the River Dee at Llangollen , Denbighshire is reputed to have been built in about 1345 by John Trevor , who was then living at nearby Trefor Hall .