It was the theoretical eastern limit of the Jewish kingdom; for a long time it separated Assyria from the Khita or Hittites; it divided the eastern from the western satrapies of Persia (Ezra iv.
The distribution of the great satrapies was changed occasionally, and often two of them were given to the same man.
The effect of these extraordinary changes, then, was the carrying out of Napoleonic satrapies in the north and centre of Italy in a way utterly inconsistent with the treaty of Luneville; and the weakness with which the courts of London and Vienna looked on at these singular events confirmed Bonaparte in the belief that he could do what he would with neighbouring states.
Under the name of Mouru this place is mentioned with Bakhdi (Balkh) in the geography of the Zend-Avesta (Vendidad, ed Spiegel, 1852-1863), which dates probably from at least 1200 B.C. Under the name of Margu it occurs in the cuneiform (Behistun) inscriptions of the Persian monarch Darius Hystaspis, where it is referred to as forming part of one of the satrapies of the ancient Persian Empire.
Cyrus the Great divided his empire into provinces; a definitive organization was given by Darius, who established twenty great satrapies and fixed their tribute (Herodot.