A strong navy to threaten the Greek city-states, and an army of combined cavalry and infantry, under a central leadership.
The Persians decided to bring all the Greek cities under control to enforce peace. They invaded in strength ten years later.
Persia's absorption of Media gave it the strength to expand into an empire covering the Middle East, north Africa and central Asia.
The leader of the Persians was Xerxes I
Persians.
Most Persians today are Muslim, but before the advent of Islam in Persia, most Persians were Zoroastrians.
The Athenians were not at the battle of Thermopylae, but were aboard their warships - hey had sent their families for sanctuary in Peloponnesian cities. The Persians took over Athens and used it as a base while the Greek fleet assembled at Salamis, where it where it met and defeated the Persian fleet.
He was Xerxes
It did when the Persians conquered Babylon.
the persians freed the Isrealites after conquering the babylonians
Most Persians today are Muslim, but before the advent of Islam in Persia, most Persians were Zoroastrians.
Cyrus the Great led the Persians, then subject to the Medes, into dominating them, and with this combined strength took over the Babylonian Empire and turned this into an empire of his own.
Among the many causes of the fall of the Roman Empire was wars with Persians, which cost the empire much of its strength. But I believe there were other causes that were more important, including civil wars and invasions of migrating Germanic peoples. For more information, please use the link below.