IMHO it's more like a case of getting invented in many places because it still needs to be invented and people are inventing it in very different forms.

You have the French/German Flammkuchen, which is an amazingly good version that I don't know why it's not widely known.

There's Lahmacun, which is the "Turkish Pizza" - a lot more spicy and thin version with minced meat with spice as topping. There's also Pide, which is thicker and closer to Italian pizza but the shape and the toppings are quite different(cubed meat, egg).

Then there are the American pizza types like Chicago-style that look significantly different than the Italian ones.

The one on the fresco looks like the Italian version.