well the label is wrong. Islam did not spread from Spain to Persia as the title states. So an incorrect title destroys an otherwise nice graphic.
Like I said, in the pursuit of absolute brevity, I often trim the verbiage to the bare minimum, assuming a certain knowledge. Perhaps I can make longer explanation versions for those who need remediation.
The "nice graphic" makes it quite clear that the disease spread north, west, and east from a turd world rat hole named Medina.