Historically, Iran has been referred to as <answer>Persia</answer> by the West, due mainly to the writings of Greek historians who called Iran Persis (Greek: Περσίς), meaning "land of the <answer>Persia</answer>ns." As the most extensive interactions the Ancient Greeks had with any outsider was with the <answer>Persia</answer>ns, the term persisted, even long after the <answer>Persia</answer>n rule in Greece. However, Persis (Old <answer>Persia</answer>n: Pārśa; Modern <answer>Persia</answer>n: Pārse) was originally referred to a region settled by <answer>Persia</answer>ns in the west shore of Lake Urmia, in the 9th century BC. The settlement was then shifted to the southern end of the Zagros Mountains, and is today defined as Fars Province.
What has the West historically referred Iran as?
Persia