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Byzantine emperor Theodosius II proclaimed his elder sister Aelia Pulcheria as Augusta.

Historical image related to Byzantine emperor Theodosius II proclaimed his elder sister Aelia Pulcheria as Augusta. from July 4, 414

Theodosius II

Eastern Roman emperor from 402 to 450

Theodosius II, called "the Calligrapher", was Roman emperor from 402 to 450. He was proclaimed Augustus as an infant and ruled as the Eastern Empire's sole emperor after the death of his father Arcadius in 408. His reign was marked by the promulgation of the Theodosian law code…
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Pulcheria

Byzantine empress (398/399 – 453)

Aelia Pulcheria was an Eastern Roman empress who advised her brother, the emperor Theodosius II, during his minority and then became wife to emperor Marcian from November 450 to her death in 453.
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List of Augustae

Roman imperial honorific title given to empresses

Augusta was a Roman imperial honorific title given to empresses and women of the imperial families. It was the feminine form of Augustus. In the third century, Augustae could also receive the titles of Mater Senatus, Mater Castrorum, and Mater Patriae.
Source: Wikipedia (CC BY-SA)