whose invasion of Greece with the largest army the world ever saw
properly belongs to Grecian history. It was reserved for the heroes of
Plataea to teach the world the lesson that the strength of armies is not
in multitudes but in discipline,--a lesson confirmed by the conquests of
Alexander and Caesar.

On the fall of the Persian Empire three hundred years after the fall of
Babylon, and the establishment of the Greek rule in Asia under the
generals of Alexander, Persia proper did not cease to be formidable.
Under the Sassanian princes the ambition of the Achaemenians was
revived. Sapor defied Rome herself, and dragged the Emperor Valerian in
disgraceful captivity to Ctesiphon, his capital. Sapor II. was the
conqueror of the Emperor Julian, and Chrosroes was an equally formidable
adversary. In the year 617 A.D. Persian warriors advanced to the walls
of Constantinople, and drove the Emperor Heraclius to despair.

Thus Persia never lost wholly its ancient prestige, and still remains,
after the rise and fall of so many dynasties, and such great
vicissitudes from Greek and Arab conquests, a powerful country twice the
size of Germany, under the rule of an independent prince. There seems
no likelihood of her ever again playing so grand a part in the world's
history as when, under the great Cyrus, she prepared the transfer of
empire from the Orient to the Occident. But "what has been, has been,
and she has had her hour."

AUTHORITIES.

Herodotus and Xenophon are our main authorities, though not to be fully
relied upon. Of modern works Rawlinson's Ancient Monarchies and
Rawlinson's Herodotus are the most valuable. Ragozin has written