It's about an enthroned woman being attended to by an attendant, Dirk, and is dated to about 100BCE.
It's a pity Lord Lansdowne had the other two sides of the funereal triptych (naiskos) removed when he decided this would look good over his front door (where it was situated from 1770 to the 20th century), as they would most likely have shown the lady (the occupant of the grave marked originally by this relief stele) enjoying other moments of domestic happiness which, as other such gravestones of the period also indicate, it was hoped she would continue to enjoy in Elysium.
It is actually quite a standard domestic scene for these kinds of depictions concerning well-to-do ladies. That she is selecting jewellery and from a slave attendant (as indicated by that person's hairstyle and clothes), is wearing snake bracelets, and that her chair's ornate carvings depict lions' paws and an eagle, all denote very high status.
Here's another older one from around 400BCE
Loud and ignorant clamours are only confused with conspiratorial insight in societies where being loud and ignorant does not preclude one's opinion from being broadcast.