In the middle of the sixth centuryBCE, the Achaemanid clan of the Persians was headed by Cyrus, who ruled, under Median domination, as sub-king of Parsa, or Persis.
In 553 BCE Cyrus led a revolt that resulted in the overthrow of the Median ruler and the rise to the power of the Achaemenids.
A more ambitious to subjugate the Greeks was attempted by Xerxes, but after a navel disaster at Salamis in 480 BCE and a decimation of the land forces at Plataea the next year, the invading forces were withdrawn to the shores of Asia Minor.