Persia rose in the southwest of the Iranian plateau. Since 600 BC, the Greeks have called this area "Persia". Until 1935, Europeans used Persia to refer to this area and the ancient monarchies located in this area. Persians, on the other hand, began to call their ancient monarchy Elam Chaher from Sassanian Dynasty (the second Persian Empire), which means "Aryan Empire".
Persia is mainly used to refer to a region in southern Iran, which was previously called "Persia" and "Pasa". These two words refer to the names of Indo-European nomads who migrated to this area around 1000 BC, and were finally replaced by Assyrians and Chaldeans.
The earliest mention of "Pasa" occurred in the historical materials of King Salamanisa III of Assyria in 844 BC. Persia is a highly developed nation among many ancient civilizations, but it was not until the third century A.D. that this civilization officially entered the historical stage under the name of Persian Empire.