Byzantine Empire under the Leonid dynasty

Byzantine Empire
457–518
Flag of Byzantium
The territory of the Eastern Roman Empire under the Leonid dynasty in 480. The Western Roman Empire, depicted in pink, collapsed in 476/480, though the regions depicted nominally continued to be under Roman rule as vassals of the Eastern Empire.
The territory of the Eastern Roman Empire under the Leonid dynasty in 480. The Western Roman Empire, depicted in pink, collapsed in 476/480, though the regions depicted nominally continued to be under Roman rule as vassals of the Eastern Empire.
CapitalConstantinople
Common languagesLatin, Greek
GovernmentMonarchy
Emperor 
• 457–474
Leo I
• 474–474
Leo II
• 474–491
Zeno
• 475–476
Basiliscus
• 491–518
Anastasius I
History 
• accession of Leo I the Thracian
7 February 457
• death of Anastasius I Dicorus
9 July 518
Preceded by
Succeeded by
Byzantine Empire under the Theodosian dynasty
Byzantine Empire under the Justinian dynasty

The Eastern Roman Empire was ruled by the House of Leo from AD 457, the accession of Leo I, to 518, the death of Anastasius I. The rule of the Leonid dynasty coincided with the rapid decline, collapse and eventual fall of the Western Roman Empire. Following the end of the Western Empire, Emperor Zeno abolished the position of Western Roman Emperor and declared himself the sole Roman Emperor. The Eastern Roman Empire would come to last for several more centuries, and subsequent dynasties would invest large amounts of resources in attempts to retake the western provinces.

The Leonid dynasty also ruled the Western Roman Empire from 474 to its abolishment in AD 480.