In January, 457 Marcian succumbed to a disease, allegedly
gangrene. He was survived by his daughter Euphemia and his son-in-law
Anthemius. Leo was at this point the
tribune of the Mattiarii, a regiment wielding the mattea (
Latin for
mace) as their weapon. Marcian had been proclaimed an
Augustus while marrying
Pulcheria, sister of
Theodosius II. Due to the marriage, he was considered a member of the
Theodosian dynasty. His only daughter was from a previous marriage and not considered heiress to the dynasty, thus with his death the dynastic succession ended. The
Byzantine army and the
Byzantine Senate had to elect a new Augustus.
Aspar, the
magister militum ("Master of soldiers") of the
Eastern Roman Empire, may have been unable to claim the throne for himself due to his
Alanic origins and
Arian religious beliefs. Though his family had served in the Roman military for generations, Aspar was still considered a barbarian and the majority of the ruling class of the Eastern Roman Empire had accepted the
Nicene Creed. Aspar used his influence in order to become a kingmaker, having earlier engineered the elevation of Marcian who had served a middler-rank officer under him. He was able to pick Leo, a candidate among his own subordinate officers, probably counting on his continued loyalty. The Senate accepted the choice. In 461, Leo founded the
Excubitors as a counterbalance to the soldiers under Aspar. He recruited the majority of its members from among the sturdy and warlike Isaurians. In 466, Tarasicodissa, an Isaurian officer of the Excubitors came forth with evidence that
Ardabur, a son of Aspar, was guilty of
treason. The scandal caused a rift in the relations of Leo and Aspar, leaving the former relying even more on the Excubitors. In 467, the alliance of Leo and Tarasicodissa was sealed with the marriage of Ariadne to the officer. To make himself more acceptable to the Roman hierarchy and the native
Greek-speaking population of
Constantinople, the new son-in-law of the imperial couple changed his name to Zeno. Their only known son of Ariadne and Zeno,
Leo II, was born within the year. In 471, Aspar and Ardabur were murdered within the
Great Palace of Constantinople by orders of Leo. Leo earned the
nickname "Macelles" (the
Butcher) for the manner of the deaths. Verina remained at the Palace. ==Widowed empress==