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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
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
Achaemenid Empire
East of the Zagros Mountains, a high plateau stretches off towards India. While Egypt was rising up against the Hyksos, a wave of pastoral tribes from north of the Caspian Sea was drifting down into this area and across into India. By the...

Definition
Akkad and the Akkadian Empire
Akkad was the seat of the Akkadian Empire (2334-2218 BCE), the first multi-national political entity in the world, founded by Sargon the Great (r. 2334-2279 BCE) who unified Mesopotamia under his rule and set the model for later Mesopotamian...

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
Empire of Trebizond
The Empire of Trebizond was an offshoot of the Byzantine Empire that existed from 1204 to 1461 CE, ruled by the Megas Komnenos Dynasty, descendants of the Komnenos Byzantine emperors. The Empire of Trebizond has been far less researched than...

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...

Definition
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
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...