There's a blue notice to the right of the door (i.e., looking towards it), it reads:
"Door to the wall-walk
This highly ornate oak door once led onto the Little Castle wall-walk. It was designed by William's architect, John Smythson, and shows the attention to detail demanded by William. It is now very weathered but it may have once been painted a deep, earthy red, like the other doors around the castle."
The William referred to was William Cavendish, 1st Duke of Newcastle (1592-1676), described by Wikipedia as, "an English polymath and aristocarat, having been a poet, equestrian, playwright, swordsman, politician, architect, diplomat and soldier." His second wife (the first dying, presumable exhausted after bearing his 10 children) sems to have been similarly multi-talented, being described as "poet, dramatist, philospher and natural scientist".
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