Excuse the rant ...
Rome? Pah! Clearly Athens is the centre of the known world.
No, wait, Euclid was from Alexandria, Eratosthenes moved to Alexandria for a good job. Archimedes was from Syracuse, Zeno from Elea, both in what is now Italy. Dammit, the STEM community has been globalised for a long time! Athens was more the world centre of luvviedom. I'm sure there's a moral in there somewhere.
Anyway, why Turing in particular? He's just one of many distinguished mathematicians, scientists and engineers in our history. His role in winning The War ... again, one of many, and who remembers R J Mitchell these days? Oh, right, Turing is beloved of the Chattering Classes for reasons that have nothing whatsoever to do with his work.