For thirty years secluded from mankind,
Here Marten linger'd. Often have these walls
Echoed his footsteps, as with even tread
He paced around his prison: not to him
Did Nature's fair varieties exist;
He never saw the Sun's delightful beams,
Save when thro' yon high bars it pour'd a sad
And broken splendor. Dost thou ask his crime?
He had rebell'd against the King, and sat
In judgment on him; for his ardent mind
Shaped goodliest plans of happiness on earth,
And peace and liberty. Wild dreams! But such
As PLATO lov'd; such as with holy zeal
Our MILTON worshipp'd. Blessed hopes! awhile
From man withheld, even to the latter days,
When CHRIST shall come and all things be fulfill'd.
Robert Southey
http://www.poemhunter.com/poem/inscription-04-for-the-apartment-in-chepstow-cas/