From the Stowe 1848 Sale Catalogue:

From [Captain Grenville’s column], two rustic bridges over an artificial lake, conduct to an urn, erected by the late Duke of Buckingham to the memory of his father, George Marquis of Buckingham. This urn bears the following inscription:—

To George Marquis of Buckingham,
A beloved Parent, an illustrious and able Statesman, this Urn is dedicated by Richard Marquis of Buckingham,
Who, lamenting his loss, and venerating his memory, endeavours to emulate his example.
A.D. 1814.

Upon the front of the pedestal, is the following translated quotation from Cicero:—

Amid these scenes, my brother, and myself, have passed our earliest years.
Sprung from an ancient and honourable race, we see ourselves surrounded here, by all that hereditary feelings
Can render sacred to us, and contemplate the footsteps of those who are gone before us;
Need more be said? Behold this place, improved, extended, and adorned, by the hand of the beloved Father,
who, under these shades, passed his declining days.

Upon the reverse of the pedestal, is the following inscription, from the Poem entitled “Human Life,” by Rogers[1]:—

When by a good man’s grave I muse alone.
Methinks an angel sits upon the stone;
Like those of old, on that hallow’d night,
Who sate and watch’d in raiment heavenly bright;
And with a voice inspiring joy, not fear,
Say, pointing upward; that he is not here;
That he is risen!

[The urn was moved in 1931 to the school precincts (National Trust 1997).]

[1] Samuel Rogers (1763–1855), English poet.