European Kingdoms

Eastern Roman (Byzantine) Empire
Prelude to the Comnenian / Komnenian Dynasty (AD 1057-1059)

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In AD 395, the Roman empire finally split permanently, creating formal Eastern Roman and Western Roman empires, acknowledging what had existed in practise for many years.

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(Information by Peter Kessler, and from External Link: History of the Byzantine Empire (Live Science).)

1057 - 1059

Succeeded Non-Dynastic ruler. Abdicated.

late 1050s

Having been harried by the Cumans, the reduced Pechenegs lose control of the entire left-bank steppe in the late 1050s, and later the right bank after which their remnant seems to migrate westwards into Danubian Eastern Roman territory or across the Carpathians into Hungary.

1059

Isaac I is succeeded by the reign of Constantine X, founder of the Ducas dynasty.