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Holy Roman Empire
The Holy Roman Empire officially lasted from 962 to 1806. It was one of Europe’s largest medieval and early modern states, but its power base was unstable and continually shifting. The Holy Roman Empire was not a unitary state, but a confederation...

Definition
Thessaly and the Duchy of Neopatras
Thessaly was an independent state in medieval Greece from 1267 or 1268 to 1394 CE, first as the Greek-ruled Thessaly and later as the Catalan and Latin-ruled Duchy of Neopatras. Under its sebastokrators, Thessaly was a thorn in the side of...

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...

Definition
Duchy of Athens
The Duchy of Athens was a Latin or Frankish state in Greece that existed from 1205 to 1458 CE. It was created in the aftermath of the Fourth Crusade (1202-1204 CE) and would be ruled for the majority of its history by the Burgundian de la...

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Byzantine Empire c. 626 CE
A map of the Byzantine empire c. 626 CE.

Definition
Justinian II
Justinian II “the Slit-nosed” ruled as emperor of the Byzantine Empire in two spells: from 685 to 695 CE and then again from 705 to 711 CE. It was after his first reign and prior to his exile that his nose was cut off by the usurper Leontios...

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...

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Division of the Byzantine Empire, 1204 CE.
This map illustrates the rise of the Latin Empire (Imperium Romaniae), a Crusader state founded by Western European forces after the Fourth Crusade's sack of Constantinople in 1204. It replaced the Byzantine Empire (Eastern Roman Empire...

Collection
21 Famous Women of World History
This collection presents biographies of 21 famous women from world history but those included represent only a small fraction of the many women, from ancient times to the present, who have made a lasting impression on the people of their...

Definition
Empress Irene
Empress Irene was the wife of Leo IV and, on her husband's death, she reigned as regent for her son Constantine VI from 780 to 790 CE. From 797 to 802 CE she ruled as emperor in her own right, the first woman to do so in Byzantine history...