I simply can't leave this without comment - and this is the best place to register thoughts.
Arcadia, if you're listening, brilliant! brilliant! brilliant!
I feel like I have just solved the Enigma code and sorted out Linear B without leaving my seat - and in less than a week (just).
If this doesn't win POTY then I can't imagine what will.
The icing on the cake was, when I had finally resolved the reason for the celebrated 10, then to unearth 2 more references to characters associated with 2 of the locations. Just a lovely flourish at the end.
Ole!