Okay, not the entire world.
Although the characters in The Crystal Crux series come from diverse backgrounds, some from Italy but others from Spain, England, France and Greece, this is the center of the tale. There is where most of the events of the ten days the book series covers happens.
There are background stories that develop about those other characters from other regions in medieval Europe, but this part of Italy is what matters for the story.
Still working on the 5th and final book in the series. Still shooting for a release date before the end of 2022.