File:Memorial, St John's College Chapel - Geograph.org.uk - 630609.jpg
The Welsh inscription at the top translates "Let us now praise famous men" (Ecclesiasticus xliv. 1.) That at the bottom is from Prys's metrical version of Psalm 121, "I will lift up mine eyes unto the hills, from whence cometh my help."
A translation of the Welsh version would be something like:
"I look to the far mountains From where comes a willing help for me"
(thanks to Alan Fryer for this).(required by the license)