Italy didn’t exist as a nation in 1280.
Florence, was a city-state, so only Florence could claim it!...........
I knew that… but none of the governments of Europe except possibly Great Britain existed in the 13th Century existed either. France did not exist as currently formed either. LOL!
So who owns the rights to claim cultural rights to this one third of a triptych? I don’t recall right now if the other two panels are in the Louvre or not. Best cultural claim is, as you say, Florence. But where was the artist in question born? Perhaps that place would have a better claim? Maybe the family who commissioned the Triptych in the first place or trace back the last known owners before it disappeared? I suspect that the current one-third owner, the woman in whose kitchen it was discovered is the only current owner and she has dispositve rights to sell it to whom and where the buy would like to take it. This cultural claim crap is ridiculous!