Byzantine Empire under the Leonid dynasty
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The Leonid dynasty also ruled the Western Roman Empire from 474 to its abolition in AD 480.
Leo I and Leo II, 457–474
After the death of Marcian and the end of the Theodosian dynasty, Leo I was placed upon the throne by the Alan general Aspar, who served as commander-in-chief of the Eastern Roman army and enjoyed a role similar to that of Ricimer in the Western Roman Empire, appointing puppet emperors. Aspar had believed that Leo I would be a weak puppet, but Leo grew increasingly independent of him and after Aspar and his son Ardabur were murdered in a riot in 471, the Eastern Empire was restored to fully Roman leadership, which it would retain for centuries to come.
By the time of Leo's accession, the Western Roman Empire had nearly collapsed entirely. Though it enjoyed a brief restoration of power under Emperor Majorian, the West had become restricted to northern Gaul, Italy and parts of Illyria by the late 460s. Leo attempted to reconquer North Africa from the Vandals. The campaign was unsuccessful and Northern Africa would remain outside of imperial control until the reign of Justinian I in the early 500s.
Leo I was the earliest emperor to be crowned by the Patriarch of Constantinople and not by a military leader, representing the ecclesiastical hierarchy. This change would eventually become permanent and the religious nature of the coronation had completely replaced the military version in the Middle Ages.
As condition for an alliance with the Isaurians, Leo married his daughter Ariadne to Tarasicodissa, who took the name Zeno, in 466. The son of Ariadne and Zeno, Leo II, succeeded upon the death of Leo I in 474 but he died after only 11 months of rule and was succeeded by Zeno.
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Zeno and Basiliscus, 474–491
The reign of Zeno saw the end of the Western Roman Empire. The dating of the end is somewhat controversial. It is sometimes dated to 476, early in Zeno's reign, when the Germanic Roman general Odoacer deposed the titular Western Emperor Romulus Augustulus, but declined to replace him with another puppet. Odoacer accepted Julius Nepos, the previously deposed Western Emperor supported by Zeno, as his sovereign and acted as his viceroy of Italy. Nepos did not return to Italy but continued to reign as Western Emperor from Dalmatia until his death in 480.
After the death of Julius Nepos, Zeno became the sovereign of Odoacer and he did not appoint another Western Emperor, instead proclaiming himself as the sole Emperor of the Roman Empire, juridically reuniting West and East for the first time in 85 years. The position would never again be divided.
With Odoacer acting increasingly independent, Zeno negotiated with the Ostrogoths of Theoderic, who had settled in Moesia. He sent the gothic king to Italy as magister militum per Italiam ("commander in chief for Italy"). After the fall of Odoacer in 493, Theoderic, who had lived in Constantinople during his youth, ruled Italy on his own. Thus, by suggesting that Theoderic conquer Italy as his Ostrogothic Kingdom, Zeno maintained at least a nominal supremacy in the West land while ridding the Eastern Empire of an unruly subordinate.
Zeno was briefly deposed by Basilicus in 475 for twenty months, but regained his throne and imprisoned Basilicus and his family in a dry cistern, where they would die from exposure.
Anastasius I, 491–518
Anastasius I, an aged civil officer of Roman origin, became Roman Emperor through marriage with the widow of Zeno, Ariadne, in 491. Anastasius reformed the coinage system introduced by Constantine I by setting the weight of the copper follis, the most commonly used coin throughout the Empire. Anastasius also abolished the chrysargyron tax, a tax that was hated due to it being collected in lump sums every four years. The monetary reforms of Anastasius lead to the State Treasury containing an enormous 145,150 kg (320,000 lbs) of gold upon his death.
Anastasius would be succeeded by Justin I, the first Emperor of the Justinian dynasty.