Et in Arcadia Ego
by Nicolas Poussin
Roughly it translates as: I (too) have (lived) in Arcadia.
The Latin phrase is used as the dedication in the novel Brideshead Revisited
by Evelyn Waugh.
Even Bertie Wooster is aware of the painting:
Nothing in my relations with this man had given me the idea that he, too, had, so to speak, once lived in Arcady.
-- The Code of the WoostersTrivia question:
What connects this painting, Queen Elizabeth II, and the KGB?