They allowed local cities and tribes to govern themselves according to their own customs, with overall provincial governors to maintain peace and external protection. And kept taxation to reasonable levels.
It had to connect the Persian Empire capital in Persia with the western provinces in West Asia.
Took over so much area the armys also joined as a big one
Helpful in what way, to whom? To himself and his family? His Persian people? The subject peoples of the empire? Please be explicit in your question so we can have a chance of answering it when we know what you want.
The Civilization that defeated Egypt, was the Persian Empire or also known as the Achaemenid Empire. The Persian Empire defeated the Egyptians while Cyrus The Greats Son (Cambyses II) was reigning over the Empire. The Egyptians didn't even bother to try and stop the Persian Empire as they we sick of their previous ruler. So I think the answer you are looking for is the Achaemenid Empire. Although they did capture Egypt, after the Persian Empire finished, all of the empire broke up into lots of different countries, as this was when the Persian Empire Fell.Hopefully This Helped.
Constantinople was the capital of the eastern part of the Roman empire so the emperor or "Caesar" who was ruling had the most power.
They divided the empire into 20 provinces with a Persian governor and the cities and tribes retained their traditional government. The governors provided internal and external security and supervised the local government.
Alexander the Great took effective control of the Empire in 331 BCE, so by 330 BCE there was no Persian Empire to rule - it was the Macedonian Empire of Alexander.
Conquest, establishing an effective provincial government system, and being able to protect the Empire and advance its prosperity.
All of them, so he could take over all of the Persian Empire.
They were so important because it led to the destruction of the Persian Empire.
Persian is a normal type so fighting type would be super effective.
In an era before electron communications, where messages were passed physically, the Persians established a system of sea, river and road transport to pass information in a timely manner.
Because the policy led to cultural diversity in the empire.
The Roman empire emerged progressively, after having gained dominence of the Italian peninsula, it expanded into Sicily and Spain in the mid-3rd Century BCE and consolidated and expanded this over the following centuries, reaching its height in the 2nd Century CE. The Persian empire existed from 550 to 330 BCE. So the first is Persian Empire.
It converted the Delian League cities it had led against the Persian Empire into an empire of its own, and ruthlessly used its financial and military resources for its own benefit and power.
Greek became the lingua franca of commerce. He married all his senior commanders to Persian women to harmonise the ruling class. He named dozens of cities Alexandria to ensure his name would not be forgotten. He appointed his general as provincial governors, and so the ruling class was Macedonian. Large numbers of Greek mercenaries remained in the Macedonian Empire and its successor Hellenistic Kingdoms created by his generals.
To produce a civilisation, after producing a surplus to finance it, you need sophisticated ways of doing things. So you need specialised workers to carry it out. This was begun in the Middle East by the Assyrian Empire, replaced by the Babylonian Empire then by the Persian Empire to carry it on and improve it.