 It managed to remain independent of the burgeoning Median Empire.Over the succeeding two centuries, Persian civilization established itself in Khuzestan, though the Elamite language is said to have survived for another thousand years, until the 5th century CE.During the early years of the reign of Shapur II (309-379), Arabs crossed the Persian Gulf from Bahrain to "Ardashir-Khora" of Fars and raided the interior.