Set into the stone wall that surrounds the Giant’s Ring is an engraved stone plaque that reads:
THIS WALL FOR THE PROTECTION OF
THE GIANT’S RING
WAS ERECTED A.D. MDCCCXLI BY
ARTHUR VISCOUNT DUNGANNON
[On whose] estate this singular relique of
is situated and who earnestly
recommends it to the care of his successors.
The bits in square brackets are illegible, so I’ve guessed the probable wording.