Aspar in the context of "Zeno (emperor)"

The Leonid dynasty or Thracian dynasty produced six Byzantine emperors during Late Antiquity, reigning over the Byzantine Empire from 457 to 518. The dynasty's patriarch was Leo I, who was made Byzantine emperor in 457. Leo's daughter Ariadne became empress and mother to an emperor, and her two husbands were themselves each made emperor in turn. Another relative whose name does not survive of Leo I or his wife Verina married the future augustus Julius Nepos (r. 474–480), the last emperor in the Western Roman Empire. The dynasty of Leo succeeded the preceding Valentinianic dynasty (r. 364–455) and Theodosian dynasty (r. 379–457) whose family trees were conjoined and ruled concurrently. Besides Julius Nepos, who administered no more than a rump state the Roman province of Dalmatia in the western empire during the fall of the west, the dynasty's emperors governed the Byzantine Empire (east).

Leo's eldest daughter Ariadne married Zeno, and their son, Leo II was proclaimed augustus and succeeded his grandfather Leo as an infant, appointing Zeno co-augustus. Leo's younger daughter, Leontia, married first the caesar Patricius, son of the magister militum Aspar, and then Marcianus, son of the augustus Anthemius (r. 467–472). When Leo II died in the year of his grandfather's death, Zeno remained augustus in the Byzantine Empire.

Patricius (Greek: Πατρίκιος, romanized: Patrikios; floruit 459–471) was an Eastern Roman caesar, the son of the powerful general Aspar, who for almost two decades was the effective power behind the throne of the Eastern Roman Empire. Of mixed Roman and barbarian origin, Patricius was destined for the imperial throne by his father. He rose to the rank of caesar under Emperor Leo I, before his father's murder in 471 led to his own downfall and possibly death.

Procopius Anthemius (Ancient Greek: Προκόπιος Ανθέμιος, romanized: Prokópios Anthémios; died 11 July 472) was the Western Roman emperor from 467 to 472. Born in the Eastern Roman Empire, Anthemius quickly worked his way up the ranks. He married into the Theodosian dynasty through Marcia Euphemia, daughter of Eastern emperor Marcian. He soon received a significant number of promotions to various posts, and was presumed to be Marcian's planned successor. However, Marcian's sudden death in 457, together with that of Western emperor Avitus, left the imperial succession in the hands of Aspar. He instead appointed Leo, a low-ranking officer, to the Eastern throne, probably out of fear that Anthemius would be too independent. Eventually, this same Leo designated Anthemius as Western emperor in 467, following a two-year interregnum that started in November 465.

Anthemius attempted to solve the two primary military challenges facing the remains of the Western Roman Empire: the resurgent Visigoths, under Euric, whose domain straddled the Pyrenees; and the unvanquished Vandals, under Geiseric, in undisputed control of North Africa. Anthemius's insistence on ruling independently placed him into direct conflict with the Gothic general Ricimer. Previously the real power behind the throne, Ricimer found that Anthemius's reign threatened his own interests. This eventually escalated into open warfare between the two, with the result that Anthemius lost not only his throne, but also his head, in 472.

Marcian (/ˈmɑːrʃən/; Latin: Marcianus; Ancient Greek: Μαρκιανός Markianos; c. 392 – 27 January 457) was Roman emperor of the East from 450 to 457. Very little is known of his life before becoming emperor, other than that he was a domesticus (personal assistant) who served under the commanders Ardabur and his son Aspar for fifteen years. After the death of Emperor Theodosius II on 28 July 450, Marcian was made a candidate for the throne by Aspar, who held much influence because of his military power. After a month of negotiations Pulcheria, Theodosius' sister, agreed to marry Marcian. Zeno, a military leader whose influence was similar to Aspar's, may have been involved in these negotiations, as he was given the high-ranking court title of patrician upon Marcian's accession. Marcian was elected and inaugurated on 25 August 450.

Marcian reversed many of the actions of Theodosius II in the Eastern Roman Empire's relationship with the Huns under Attila and in religious matters. Marcian almost immediately revoked all treaties with Attila, ending all subsidy payments to him. In 452, while Attila was raiding Roman Italy, then a part of the Western Roman Empire, Marcian launched expeditions across the Danube into the Great Hungarian Plain, defeating the Huns in their own heartland. This action, accompanied by the famine and plague that broke out in northern Italy, allowed the Western Roman Empire to bribe Attila into retreating from the Italian peninsula.

Basiliscus (Ancient Greek: Βασιλίσκος, romanized: Basilískos; died 476/477) was Eastern Roman emperor from 9 January 475 to August 476. He became magister militum per Thracias in 464, under his brother-in-law, Emperor Leo I (r. 457–474). Basiliscus commanded the army for an invasion of the Vandal Kingdom in 468, which was defeated at the Battle of Cape Bon. There were accusations at the time that Basiliscus was bribed by Aspar, the magister militum; many historians dismiss this, instead concluding that Basiliscus was either incompetent or foolish for accepting Vandal King Gaiseric's offer of a truce, which the latter used to construct fireships. Basiliscus's defeat cost the Eastern Empire 130,000 pounds (59,000 kg) of gold, causing the empire to hover above bankruptcy for 30 years. When Basiliscus returned to Constantinople, he sought refuge in the Hagia Sophia. His sister, Empress Verina, secured him a pardon and he left the church to retire in Neapolis.

When Emperor Leo died in 474, his grandson Leo II (r. 474) took power, but soon died; his father, Zeno (r. 474–475, 476–491) ascended the throne in the same year, in a politically precarious position. Verina conspired to install the magister officiorum Patricius, her lover, as emperor. This plot was supported by Basiliscus, who succeeded in recruiting Isaurian brothers Illus and Trocundes, as well as Verina's nephew Armatus. Zeno fled on 9 January 475, either after learning of the plot or after Verina warned him that his life was in danger. Although Patricius was Verina's intended successor, Basiliscus convinced the Eastern Roman Senate to acclaim him instead.

Ardabur (Ἀρδαβούρ, died 471) was an Eastern Roman magister militum of Alanic descent. He was the son of the influential general Aspar. He served as consul in 447 and as magister militum per Orientem from 453 until 465 or 466. Ardabur apparently often served under his father during his campaigns.

He was removed from this post in 466 after being accused of a treasonous plot involving the Sasanian Empire, probably by his father's political enemies. The accusation contributed to Aspar's fall from power. Both Ardabur and Aspar were killed in 471 as part of a conspiracy between the Isaurians and the emperor Leo I.

Ardabur (Greek: Ἀρδαβούρ) served as magister militum in the East Roman army in the 420s, under Theodosius II. He was of Alanic origin.

During the Roman-Persian War of 421–422, he ravaged Arzanene and besieged Nisibis. After the war ended, Ardabur was promoted to the rank of magister militum praesentalis.