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Sasanian Empire
The Sasanian Empire (224-651 CE, also given as Sassanian, Sasanid or Sassanid) was the last pre-Islamic Persian empire, established in 224 CE by Ardeshir I, son of Papak, descendant of Sasan. The Empire lasted until 651 CE when it was overthrown...

Definition
Ancient Persian Government
The government of ancient Persia was based on an efficient bureaucracy which combined the centralization of power with the decentralization of administration. The Achaemenid Empire (c. 550-330 BCE) founded by Cyrus the Great (r. c. 550-530...

Definition
Parthia (Empire)
The Parthians ruled from 247 BCE to 224 CE creating a vast empire that stretched from the Mediterranean in the west to India and China in the east. East of the Caspian Sea there emerged from the steppe of Central Asia a nomadic Scythian tribe...

Definition
Ancient Persia
Persia (roughly modern-day Iran) is among the oldest inhabited regions in the world. Archaeological sites in the country have established human habitation dating back 100,000 years to the Paleolithic Age with semi-permanent settlements (most...

Definition
Roman Empire
The Roman Empire, at its height (c. 117 CE), was the most extensive political and social structure in western civilization. By 285 CE the empire had grown too vast to be ruled from the central government at Rome and so was divided by Emperor...

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Discovering the Glories of Persia
Iran, or Persia as it was formerly known, is a country with a long and rich history stretching back thousands of years and where many civilisations thrived. With 24 historical sites registered on the UNESCO World Heritage List and each with...

Definition
Ancient Persian Governors
The Achaemenid Persian Empire functioned as well as it did because of the efficient bureaucracy established by its founder Cyrus the Great (r. c. 550-530 BCE) which was administered through the satrapy system. A Persian governor of a province...

Definition
Byzantine Empire
The Byzantine Empire, often called the Eastern Roman Empire or simply Byzantium, existed from 330 to 1453. With its capital founded at Constantinople by Constantine I (r. 306-337), the Empire varied in size over the centuries, at one time...

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Territorial Expansion of the Sasanian Empire
This map shows the territorial expansion of the Sasanian Empire from 226 to 651 CE.

Definition
Western Roman Empire
The Western Roman Empire is the modern-day term for the western half of the Roman Empire after it was divided in two by the emperor Diocletian (r. 284-305 CE) in c. 285/286 CE. The Romans themselves did not use this term. At its height (c...