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I assume you are referring to Darius the third. Darius III formed paranoia over the years, and by the time Alexander invaded, he was crazy. He suspected many of his generals of treason. For instance, when one general made a tactical retreat, Darius III suspected him of turning on his nation and had him killed. Four of the seven major generals of Persia were killed by Darius, crippling the Empire's military movement. By the time Darius III died, much of the organization had collapsed, due to his mental illness. With no organized government, the provinces of Persia governed themselves. During this period, however, there were many self proclaimed kings, such as Alexander, Bessus, Smerdis, etc. However, none actualy managed to take a hold over the Empire, only over the city they resided in.

However, Persia soon recovered, and around 247 BC, the empire re-emerged under the Parthian dynasty.

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11y ago
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7y ago

It did not decline. It remained stable until taken over by Alexandria the Great's Macedonia 150 years later.

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Q: What caused the Persian Empire to decline after the death of Darius?
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Why did the Persian Empire decline after darius and xerxes left the throne?

At this time presian rulers raised taxes to pay for their luxuries. This angered their subjects and caused many rebellions. Also, the persian royal family fought over who was to be king. Sons were constantly plotting to take over the throne. As a result, six of the nine rulers after Darius were murdered. These problems weakend the Empire and led to its decline.


What caused the decline of the Persian Empire?

The assault by Alexander the Great, who replaced the empire with his own Macedonian Empire. It was split up into several Hellenistic kingdoms after Alexander's death.


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The Persian Empire had no one to rebel against, it was the strongest power in the region until it was taken over by Alexander the Great.


What caused the Persian Empire to collapse?

Its defeat and takeover by Alexander the Great.


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The Greek city-states in Asia Minor within the Persian Empire revolted.


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When the Greek city-states within the Persian Empire in Asia Minor revolted in 499 BCE, mainland Greece cities Eretria and Athens sent military force to assist this Ionian Revolt. After the revolt was put down, Darius decided to punish these cities and sent an expedition. This was repelled at Marathon, so Darius decided that the only way to stop the mainland Greek city-states disturbing the peace in his empire was to bring them under control of a Persian governor. He began bribing the cities, and planned an invasion to bring the others under control, but died and the project was taken on by his successor Xerxes.


Why did the Persian empire link itself to Europe?

King Darius the Great was 'rounding out' the empire he inherited from Cyrus the Great and Cambyses II, trying to take over the north of the Black Sea and Thrace. In doing so he became enmeshed with Macedonia and the Greek cities of mainland Greece, all of which caused him grief.


Why did the Persian Empire initially link itself to Europe?

King Darius the Great was 'rounding out' the empire he inherited from Cyrus the Great and Cambyses II, trying to take over the north of the Black Sea and Thrace. In doing so he became enmeshed with Macedonia and the Greek cities of mainland Greece, all of which caused him grief.