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Roman Empire
The Roman Empire, at its height (c. 117), was the most extensive political and social structure in western civilization. Building upon the foundation laid by the Roman Republic, the empire became the largest and most powerful political and...

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...

Definition
Byzantine Empire
The Byzantine Empire existed from 330 to 1453. It is often called the Eastern Roman Empire or simply Byzantium. The Byzantine capital was founded at Constantinople by Constantine I (r. 306-337). The Byzantine Empire varied in size over the...

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Sacsayhuaman Panorama
The Inca Sacsayhuaman fortress-temple complex at Cuzco. The structure was begun in the reign of Pachacuti Inca Yupanqui (1438 - 1471 CE) and completed by his successors.

Definition
Empire of Nicaea
The Empire of Nicaea was a successor state to the Byzantine Empire, or rather a Byzantine Empire in exile lasting from 1204 to 1261 CE. The Empire of Nicaea was founded in the aftermath of the sacking of Constantinople during the Fourth Crusade...

Definition
Mali Empire
The Mali Empire (1240-1645) of West Africa was founded by Sundiata Keita (r. 1230-1255) following his victory over the kingdom of Sosso (c. 1180-1235). Sundiata's centralised government, diplomacy and well-trained army permitted a massive...

Definition
Songhai Empire
The Songhai Empire (aka Songhay, c. 1460 - c. 1591) covered what is today southern Mauritania and Mali. It replaced the Mali Empire (1240-1645) as the most important state in West Africa. Originating as a smaller kingdom along the eastern...

Definition
Ghana Empire
The Ghana Empire flourished in West Africa from at least the 6th to 13th century CE. Not connected geographically to the modern state of Ghana, the Ghana Empire was located in the western Sudan savannah region (modern southern Mauritania...

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
Mongol Empire
The Mongol Empire (1206-1368) was founded by Genghis Khan (r. 1206-1227), first Great Khan or 'universal ruler' of the Mongol peoples. Genghis forged the empire by uniting nomadic tribes of the Asian steppe and creating a devastatingly effective...